What size slow cooker is right for a one-person batch?
A 1.5 to 2 quart slow cooker is the right size for lentil soup made for one or two people, and both lentil recipes in my cookbook are built around a 2-quart (1.9 liter) bowl. A full-size 6 or 7 quart cooker will still work, but the liquid spreads thin across the bottom and the lentils near the edge can overcook before the ones in the center are tender, because the heating element is calibrated for a much bigger batch. If a mini cooker is not in your kitchen yet, you can still make a half batch in a larger one: fill it no more than a third full, and start checking for doneness earlier than the recipe states, since a shallow layer heats faster than a full one. Our guide to slow cooker recipes for one or two people covers sizing for every dish in the book, not just soup.
Do lentils need to be soaked before slow cooking?
Lentils do not need soaking before they go into a slow cooker, which is the detail most general slow cooker guides skip. Unlike dried kidney beans or chickpeas, lentils have a thin skin and a small footprint, so they soften fully in the low, moist heat of a slow cooker without a pre-soak. The only prep the two lentil recipes in my cookbook ask for is a rinse under cold water and a quick pick-through to remove any small stones or shriveled pieces, which dried lentil bags occasionally contain even after processing. Red lentils, used in the lemony soup below, break down further than brown or green lentils and thicken the broth on their own, so no separate thickener is needed. Brown lentils, used in the Greek-inspired stew, hold their shape better and give the dish more bite. Either way, skip the soaking step recipes for larger dried beans call for. You do not need to spend a day on it.
How long does lentil soup take in a slow cooker?
Red lentil soup made with 130 grams of dried lentils is ready in about 4 to 5 hours on LOW, once the carrots are soft and the lentils have collapsed into the broth. The Greek-inspired brown lentil and tomato stew takes a little longer, about 5 to 6 hours on LOW, because brown lentils hold their structure longer than red ones, plus a final 30 minutes once the tomatoes go in so everything heats back through. Neither recipe needs stirring during the cook, and neither benefits from HIGH: pushing the heat does not meaningfully shorten the time and makes it easier to end up with lentils scorched onto the bottom of a small cooker. If you are away from the kitchen all day, both times fall comfortably inside a typical workday, and a programmable cooker that switches to warm when the timer ends means neither dish overcooks while you are out.
Red Lentil Soup with Lemon
Red lentils break down into a thick soup. Stir well before serving to bring the vegetables and lentils together.
Ingredients
- 130 g (4.6 oz) split red lentils, dry, rinsed
- 100 g (3.5 oz) carrot, cut into 1/4-inch pieces
- 80 g (2.8 oz) onion, finely chopped
- 6 g (0.2 oz) garlic, minced
- 2 tsp olive oil
- 1/2 tsp ground cumin
- 30 g (1.1 oz) lemon juice
- 6 g (0.2 oz) fresh parsley, chopped
- 650 ml water (about 2 3/4 U.S. cups)
- 1/8 tsp table salt
Method
- Put the carrots, onion and garlic in the bowl. Add the rinsed lentils, cumin, oil and water; stir and cover.
- Cook on LOW until the lentils have collapsed and the carrots are soft, checking from 4 hours.
- Stir in the measured salt. Stir vigorously to thicken the soup. Add the lemon and parsley, then divide equally.
Storage: Refrigerate promptly in shallow covered containers; use within 3 days. Reheat to 165°F / 74°C.
Estimated nutrition per serving
- Calories
- 316
- Protein
- 17.3 g
- Fiber
- 9.3 g
- Sodium
- 202 mg
- Carbs
- 52.2 g
- Fat
- 5.5 g
- Sat. fat
- 0.8 g
How much sodium do you save by cooking lentils from dried instead of canned?
Dried lentils cooked from scratch start at close to no sodium before any salt is added, while a half-cup of canned lentils carries roughly 320 milligrams from the canning liquid alone, based on USDA FoodData Central data for canned lentils, before broth, bouillon or seasoning add more. Both lentil recipes in my cookbook measure salt by the pinch instead of trusting a can: the lemony red lentil soup uses just 1/8 teaspoon of table salt for two full servings, and the Greek-inspired tomato stew does the same, leaning on lemon juice, garlic, oregano and feta for flavor instead. A full serving of the red lentil soup still comes in at 202 milligrams of sodium, less than a plain half-cup of canned lentils by itself, and the tomato stew is 380 milligrams, most of it from the 15 grams of feta on top of each bowl rather than the lentils. For more on where sodium hides in slow cooker recipes, see low sodium slow cooker recipes for seniors.
How much protein and fiber is in a serving of lentil soup?
Lentils are naturally high in both protein and fiber, and that holds up in cooked, one-person portions. A serving of the lemony red lentil soup has 17.3 grams of protein and 9.3 grams of fiber, and a serving of the Greek-inspired lentil and tomato stew has 20.2 grams of protein and 11.6 grams of fiber, the extra coming from the feta and a slightly larger portion of lentils. Research on protein and aging recommends adults over 65 eat at least 1.0 to 1.2 grams of protein per kilogram of body weight a day to protect muscle, according to the PROT-AGE Study Group (Journal of the American Medical Directors Association, 2013). For a woman who weighs 65 kilograms, that works out to 65 to 78 grams across the whole day, so one bowl of the stew supplies roughly a quarter of it in a single meal. Our guide to protein intake for women over 40 has the full picture.
Greek-Inspired Lentil and Tomato Stew
The lentils soften in water before the tomatoes are added. Feta is divided between the bowls at the table.
Ingredients
- 130 g (4.6 oz) brown lentils, dry, picked over and rinsed
- 250 g (8.8 oz) no-salt-added canned tomatoes with juice, chopped
- 100 g (3.5 oz) carrot, cut into 1/4-inch pieces
- 70 g (2.5 oz) onion, finely chopped
- 6 g (0.2 oz) garlic, minced
- 2 tsp olive oil
- 1 tsp dried oregano
- 30 g (1.1 oz) feta, crumbled
- 20 g (0.7 oz) lemon juice
- 550 ml water (about 2 1/4 U.S. cups)
- 1/8 tsp table salt
Method
- Add the lentils, carrot, onion, garlic, oregano, oil and water. Cover and cook on LOW, checking from 5 hours, until the lentils are tender.
- Stir in the tomatoes and their juice. Cover and cook about 30 minutes longer, until hot throughout.
- Stir in the measured salt. Add the lemon. Divide equally and top each bowl with 15 g feta.
Storage: Refrigerate promptly in shallow covered containers; use within 3 days. Reheat to 165°F / 74°C.
Allergens: milk. Check packaged ingredients for additional allergens.
Estimated nutrition per serving
- Calories
- 371
- Protein
- 20.2 g
- Fiber
- 11.6 g
- Sodium
- 380 mg
- Carbs
- 56.2 g
- Fat
- 8.9 g
- Sat. fat
- 2.8 g
Do lentils help control blood sugar after menopause?
Insulin sensitivity tends to drop after menopause, part of why fat can start collecting around the middle even without a change in diet, a pattern covered in our guide to insulin resistance after menopause. Lentils are a reasonable food to lean on here. In an 8-week randomized trial, adults with an enlarged waist circumference who ate 300 or 600 grams of cooked lentils in place of meat at a midday meal saw their insulin resistance score improve in a dose-dependent way, while it got worse in the group eating no lentils at all (Nutrition Research, 2022). The study was not limited to lentil soup or to women, but the mechanism, fiber and resistant starch slowing the rise in blood sugar after a meal, applies just as well to a bowl of soup as to any other lentil dish. Most participants in the study also tolerated the larger lentil amounts with only mild gas or bloating, not the discomfort many people expect.
How do you freeze and reheat a single portion of lentil soup?
Both lentil recipes here make two servings, which means eating one bowl fresh and freezing the second the same day it is cooked, once it has cooled at room temperature for no more than two hours. Portion the extra serving into a single shallow, airtight container rather than one deep pot, since a shallow layer chills and later reheats more evenly. Lentil soup freezes well for up to three months without losing its texture, because lentils hold their structure through freezing far better than a delicate protein like fish does. When you are ready to eat it, thaw the container in the refrigerator overnight, then reheat on the stovetop or in the microwave until it reaches 165°F (74°C) throughout, stirring partway through if using a microwave so the center does not stay cold. Our meal plan for one person with a grocery list is built around this same batch-and-freeze pattern.
Can lentil soup help with blood pressure after menopause?
Lentil soup will not replace blood pressure medication, but it fits neatly into the kind of eating pattern that helps after menopause, when blood pressure tends to climb as estrogen's protective effect fades, a shift our article on why blood pressure rises in perimenopause covers in full. Lentils bring two things that matter here: almost no sodium in their raw state, and potassium, which works against sodium's effect on blood pressure. A meta-analysis of legume intake, including lentils, beans, peas and soybeans, found randomized trials showed a protective effect on total and LDL cholesterol, even though the same review found no clear link to lower cardiovascular disease risk in cohort studies of adults who already ate very little legume overall (Food & Nutrition Research, 2023). That is a modest, honest result, not a cure, and it is why heart health after menopause is worth its own read: see the diet pattern that protects your heart in menopause.
My Perspective
I make a version of this lentil soup almost every week now, mostly because it survived the test that kills most of my healthy-eating plans: it does not need me to be a different, more organized person to actually happen. Rinse, dump, walk away for a few hours. Eat one bowl. Freeze the other. I used to think of lentils as a big-pot food, something you made for a family or a potluck, and that assumption kept me from cooking them at all once it was just me at the table. Sizing the recipe down, and sizing the cooker down with it, is what changed that. If you are cooking for one and have been skipping legumes because every recipe online serves eight, these two are proof that is an old habit, not a rule. Both are in my book, The Mediterranean Slow Cooker Cookbook for Seniors, alongside the same two-stage trick I use for slow cooker fish. The bigger story of how menopause changes what and how you eat is in Estrogen Left the Chat: Biohacking Menopause.
Not sure which of your symptoms are hormonal? The free Receipts symptom decoder helps you track your own pattern, or start with the 60-second quiz.
A note from Marilyn: This article is educational and does not replace medical advice. If you take blood thinners, follow a sodium or protein limit for kidney disease, or manage diabetes with medication that can cause low blood sugar, talk with your doctor or a registered dietitian before making a big change to how much lentils or fiber you eat. I am a nutrition specialist, not a physician.
Frequently asked questions
Can you put dried lentils straight in a slow cooker?
Yes. Dried lentils go straight into a slow cooker without soaking, unlike larger dried beans such as kidney beans or chickpeas. Rinse them first and pick out any small stones, then add them with the other ingredients. Red lentils cook fastest, becoming soft and thick in about 4 to 5 hours on LOW, while brown lentils hold their shape a little longer, closer to 5 to 6 hours.
How many lentils make one serving of soup?
About 65 grams of dried lentils makes one serving of soup, since the recipes here use 130 grams of dried lentils across two servings. That cooks up to a full bowl of finished soup per person, enough for a meal with 17 to 20 grams of protein depending on the recipe.
Is lentil soup good for weight management after menopause?
Lentil soup can support weight management after menopause because it pairs protein and fiber in one bowl, and both increase fullness more than refined carbohydrates do. A serving of the recipes here provides 17 to 20 grams of protein and roughly 9 to 12 grams of fiber, without relying on added fat or salt for flavor. It is not a weight loss food on its own, since total calories and the overall eating pattern still matter more than any single dish.
Can you make lentil soup in a large slow cooker if you only have a big one?
Yes, a large 6 or 7 quart slow cooker can still make lentil soup for one, but fill it no more than a third full and start checking for doneness earlier than the recipe states, since a shallow layer of food in an oversized cooker heats faster than a full one. A dedicated 1.5 to 2 quart mini cooker gives more even results and is worth the trade if you cook for one most nights.