In a large pot cook with boiling salted water cook pasta until al dente. Drain.
Meanwhile, in a large frypan over medium heat cook beef mince and chopped onions until brown. Stir in tomato sauce, sugar, salt, garlic and pepper. Remove from heat.
In a large bowl combine the cottage cheese, sour cream, softened cream cheese, spring onion and green capsicum.
To assemble, 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 preheated (180 degrees C) oven for 30 minutes. Let stand 10 minutes before serving.