For the tomato sauce, I use 2 8oz cans of tomato sauce (not the prepared stuff, just plain old sauce), 2 8oz cans of diced tomatoes drained, 1 can of tomato paste, and 2lbs of ground beef. Than you can add seasoning to taste. If you use fresh herbs and garlic/onions to season the sauce, it's generally a lot stronger. I recommend dried basil, thyme, and garlic. This will make enough sauce for a spaghetti dinner for 5 with two lunches leftover (that's how we measure in our family :) )
As for bananas, dip them in chocolate or make banana splits.