A wholesome, deeply comforting soup crafted from slow-simmered stock, aromatic garden vegetables, and fresh herbs, served with crusty bread.
Cook the onion, carrot, and potato in the butter until softened.
Add the tomato paste and cumin and fry for 1 minute.
Add the lentils and stock and simmer 25 minutes until the lentils break down.
Blend until smooth, thinning with hot water if too thick.
Season with salt and lemon juice and serve hot.