Duck Breast With Tomatoes

Preparation:

Preparation: Peel the grapefruit over a bowl to collect the juice. Cut the pulp into cubes, put them in a pot with their juice and that of the orange. Add the sugar, two grains of pepper, a little water and, only if you like the taste, a pinch of cinnamon. Cook over medium heat for a quarter of an hour. Meanwhile, make small incisions in the fattest part of the breasts and brown them over high heat in a pan with a spoonful of oil. Continue cooking in the oven for 10 minutes. Remove, keep the meat warm and let it rest before slicing it. Pour the vinegar into the baking pan, stir. Add two tablespoons of grapefruit juice. Add salt and pepper and reduce to low heat. Adjust salt and pepper. Mix a knob of butter into the mixture, stirring carefully. Cut the breasts into slightly oblique slices, arrange them on a serving plate and cover them with the sweet and sour sauce.