My mum's friend is Italian, and this is the way she makes hers - really yummy.
Meat sauce for 8 people maybe 700g of mince
1 onion - finely chopped
1 clove of garlic - crushed
1 teaspoon of sugar
4 tablespoons of tomato paste
2 tins of tomato puree

In a large saucepan, fry the onion and garlic until soft, add the mince and brown, then add the sugar, tomato paste, puree and salt and pepper to taste. I also add one can of water and the let it simmer away, until most of the liquid has evaporated. Seems to make it a nice rich sauce then.
White/cheese sauce:
60g butter
1/3 cup plain flour
salt, pepper
pinch nutmeg
2 cups of milk
125g cheddar cheese
3 tablespoons grated parmesan cheese.
(if you like cheesy lasagne you could double the ingredients - if you find you have too much, you can add it to your left overs the next night
Melt butter in a saucepan, add flour, salt, pepper and nutmeg, blend until smooth.
Stir over heat 1 minute, gradually add milk, stir until sauce boils and thickens, reduce heat, cook 1 minute. remove from heat, stir in grated cheeses, stir until cheese melts.

using a large baking dish spoon a little of the meat sauce into the bottom of the dish.
Place instant lasagne sheets on top - may need to trim so none overlap. Top with mince sauce, then cheese sauce and sprinkle some extra grated parmesan cheese over the top. Repeat this process 2 times finishing with the cheese sauce on top - sprinkled with more cheese.
Bake in moderate oven for 40minutes or until top is golden.