Simple Turkish Lentil Soup! Chop up an onion, carrot, and potato then sauté them in about 1 tablespoon of olive oil. Add 1 1/2 cups red or yellow lentils plus 5 cups of vegetable (or chicken) broth. Bring to a simmer and cook until lentils are falling apart, about 20 minutes, then purée (immersion or regular blender). Season with salt and freshly ground pepper. Serve with red pepper flakes and plenty of fresh lemon slices.