Can I substitute red lentils for green or brown lentils, and how should I adjust the cooking time?
Yes—red lentils will work, but they soften much faster and break down into a creamy texture. Add them only during the last 15–20 minutes of simmering (instead of the full 30–40 minutes) and start checking for doneness after 12 minutes to prevent over-cooking.
Can I make this soup in an Instant Pot or slow cooker, and what adjustments are needed?
Yes—use the Instant Pot’s Sauté function for the onion, garlic, and veggies, then add the remaining ingredients, lock the lid, and pressure-cook on High for 10 minutes with a 10-minute natural release; stir in the greens and lemon juice after venting. For a slow cooker, combine everything except the greens and lemon (reduce broth by about 1 cup since there’s no evaporation) and cook 6–8 hours on Low or 3–4 hours on High, adding the greens and lemon during the final 15 minutes.
How should I store and reheat leftovers, and does this soup freeze well?
Let the soup cool, then store it in airtight containers in the refrigerator for up to 4–5 days; reheat gently on the stovetop or in the microwave, adding a splash of broth or water to loosen if needed. It also freezes beautifully—portion into freezer-safe containers or zip bags (leave a little headspace), freeze for up to 3 months, thaw overnight in the fridge, and rewarm as above.