boil 1 box of lasagne noodles in as much water as possible with a tbsp salt
mix together 1 tub of part skim ricotta cheese with 2 or 3 cups of stemmed spinach
fry up some ground beef
mix together tomato sauce and the beef and let simmer on medium low heat
shred up enough mozzarella to go on top of the lasagne.
Now layer the lasagne, sauce, noodles, spinach, and so on until it's to the top. Now you put mozzarella on top.
Bake on 350 covered with wax paper or foil until bubbly.