In a large pot cook with boiling salted water, cook pasta until al dente. Drain.
Meanwhile, in a large frying pan over medium heat cook minced beef and chopped onions until brown. Stir in passata, sugar, salt, garlic and pepper. Remove from heat.
In a large bowl, combine the cottage cheese, soured cream, softened cream cheese, spring onion and green pepper.
In a greased 20x30cm baking dish, spread half of the cooked and drained pasta. Top with half of the meat mixture. Cover with cheese mixture and remaining pasta and meat sauce. Sprinkle with grated Parmesan cheese.
Bake in a 180 C / Gas 4 oven for 30 minutes. Let stand 10 minutes before serving.