Mixing brown lentils with minced beef not only boosts the texture and fibre content of these healthy Mediterranean meatballs, but also adds to their flavour.
Make the tomato sauce. Combine the onions, tomatoes and red wine in a pan. Bring to the boil, lower the heat, cover the pan and simmer for 30 minutes. Purée the mixture in a blender or food processor, then return it to the clean pan and set aside.
Make the meatballs. Heat the oil in a large, heavy pan and cook the chopped onions, celery and carrots for 5’10 minute