Lentil and Tomato Soup for Weeknights

A pantry-friendly soup with carrots, lentils and wholegrain toast.

Illustrative food photography, rather than an exact serving of this recipe.

A tomato-and-lentil soup for two generous dinner bowls

Use ready-cooked canned lentils for this version. They provide the body while finely cut carrot and onion form the vegetable base. The recipe serves two generously with toast; it can also be divided into four smaller bowls as part of another meal. This is an original recipe plan with no kitchen-test result claimed. The timings are starting estimates: the carrot's tenderness and the actual consistency determine when to finish.

• 480 g drained ready-to-eat canned lentils
• 400 g canned chopped tomatoes, including their juice
• 150 g peeled onion, cut into approximately 5 mm dice
• 150 g carrot, washed, trimmed and cut into approximately 5 mm dice
• 5 g peeled garlic, finely chopped
• 600 ml prepared vegetable stock, made according to its label
• 15 ml olive oil
• 1 teaspoon dried thyme
• 1/8 teaspoon ground black pepper
• 10 ml lemon juice, optional, added after tasting
• 120 g wholegrain bread for toast

A three-litre saucepan with a lid provides useful room for stirring. Have a wooden spoon, sieve and ladle ready. Use stock that suits the people eating; celery, wheat and other allergens can appear in stock products. The can's total weight is not the same as its drained lentil weight.

Build the base without scorching the garlic

1. Drain and rinse the lentils. Wash and prepare the vegetables, then keep the cutting board clear. Heat the oil over medium-low heat in the saucepan.
2. Add onion and carrot. Stir for approximately eight to ten minutes, adjusting the heat so they soften without burning. If they catch, add 15 ml drinking water and loosen the bottom with the spoon. Deep browning is not required.
3. Add garlic and thyme. Stir for about thirty seconds, stopping before the garlic darkens. Immediately add tomatoes and stock, then scrape any softened vegetable pieces from the base.
4. Add the drained lentils and pepper. Bring to a gentle boil, reduce to a steady simmer and partly cover. Stir occasionally and check the carrot after fifteen minutes. Continue until a small piece can be cut easily with the edge of a spoon.
5. Remove the lid, stir and assess thickness. If too thin, simmer uncovered briefly, stirring more often as it thickens. If too thick, add hot drinking water in 50 ml increments. Toast the bread separately near serving time.

Choose a clear texture and flavour finish

The soup should contain recognizable lentils and vegetables in a tomato broth that lightly coats a spoon. For more body without a blender, mash a few spoonfuls of lentils against the side of the pan and stir them back. Do not mash every portion unless you want a much smoother result. A little thickening can happen as the soup stands.

Taste using a clean spoon after the carrot is tender. Stock and canned products vary in salt, so do not add a fixed extra spoonful automatically. If the tomato tastes flat, try the optional lemon juice in two 5 ml additions, tasting between them. If it is already sharp, omit lemon. A very concentrated soup may need water rather than more seasoning. Texture and flavour adjustments are separate decisions.

Substitutions and common questions

Can dried lentils replace canned lentils? Not gram for gram in this method. Dried varieties need their own inspected preparation instructions, liquid and cooking time. Cook them separately according to reliable guidance, then weigh the required cooked amount before making this version.

For a different herb finish, omit thyme and add 10 g chopped parsley at serving. Replace up to 100 g carrot with the same prepared weight of finely diced celery only if suitable for the diners. The flavour changes, and celery is a relevant allergen. Bread can be omitted or replaced appropriately; it is not needed to thicken the pan.

Why is the carrot still firm? Check the dice size and actual simmer rather than adding more lentils. Larger pieces take longer. Add a little hot water if the pan is becoming dry while they finish. Do not use a longer unattended simmer as the solution to every texture problem.

Cool a portion, not the whole stockpot

Serve promptly. Divide leftovers into shallow containers and refrigerate within two hours; use one hour when conditions exceed 32°C/90°F. Keep the refrigerator at 4°C/40°F or below. For this meal, plan to eat refrigerated leftovers within 48 hours, or freeze promptly if that will not be possible. Keep the preparation date on the container.

Reheat only the portion needed, stirring so the centre heats too. Bring reheated soup to a rolling boil and check it reaches 74°C/165°F throughout. Add a little water if necessary. See USDA guidance on cooling and reheating leftovers and the Food Standards Agency's 48-hour leftover guidance. Freezing or reheating does not make soup safe after an unsuitable room-temperature wait.