Cut meat in 4 serving pieces, sprinkle each piece with salt and pepper, and bake in a moderately-heated oven with half the butter, sprinkling the meat with its gravy now and then. When meat is half-baked, add rice; remove the baking pan from the oven and leave it aside while you prepare the yogurt sauce:
Sauté flour in butter until mixed thoroughly. Mix yogurt with salt, pepper and eggs until a uniform mixture is obtained, and finally stir in the flour. Put the sauce mixture in the baking pan; sauté it with the meat pieces and bake at 375 degrees F for about 45 minutes.