Cook the rice in boiling salted water for about 20 minutes at low heat. In the meantime peel the shallots. Wash the grapes, cut the dark grapes in half and remove the seeds. Wash the meat and dab dry.
Sear in hot oil from both sides. Season with salt and pepper. Fry over medium heat for 2-3 minutes. In the meantime add shallots. Remove the meat and keep warm.
Swirl the grapes in the frying fat, add the stock. Bring to the boil, sprinkle with sauce thickener. Bring to the boil again. Season to taste with salt and cayenne pepper. Sprinkle everything with chives and arrange on plates.