Wash and quarter the tomatoes. Peel garlic and chop finely. Wash sage and shake dry. Pluck the leaves from the stalks and cut into fine strips
Heat the oil in a pot. Sauté the garlic, tomatoes and 1 teaspoon sugar in it. Add the lentils, 2/3 sage and tomato paste, sauté briefly. Add broth and tomatoes, cover and cook for about 10 minutes
Season soup with salt, pepper and a little vinegar. Arrange the soup, sprinkle with the remaining sage