Onion stew in the oil for 1 minute. Add the meat and fry while stirring until pozachervi. Pour the tomatoes and crushed bouillon cube. Everything simmer 3-4 minutes. The potatoes are placed for 5 minutes in boiling water and drain. In pan lining layered potatoes, meat mixture and courgettes. Fix is ​​prepared according to package directions and pour it moussaka. Put it to bake for 30 minutes at 180 C. Sprinkle with cheese and bake again until browned.