I'm not 100% sure where the idea came from, but there it was: tomatoes filled with lentils.
Peel some good sized tomatoes. Carefully core them and remove their seeds and juice. Fill with room temperature lentils and a sauce made from the lentil cooking liquid, lemon juice, mustard, salt, pepper, and good olive oil. Heat in the microwave for 30s or so. Drizzle with a bit more of the sauce and serve with good bread.