Cook pasta in salted water . Drain and mix with the melted butter and grated feta cheese. Cut the mushrooms and cook in lightly salted water with a few grains of black pepper. Divide the pasta into two and one half put the drained mushrooms . In a buttered pan, sprinkled with breadcrumbs put the macaroni without mushrooms. On them spread the pasta with mushrooms. Top rank butter pieces and cook in the oven. Shortly before the dish is ready, sprinkle with grated cheese and black pepper. The dish is flooded with whipped cream or tomato juice. After constipation pasta can be flooded with a mixture of 2 tablespoons of yogurt, two broken eggs and again to seal about 5 minutes .