Step 1: -boil the noodles (if needed), rinse it and put it aside.
Step 2: -heat a bit of oil/butter/margarine on a pan, add the onions until it softened
Step 3: -add your leftover sausage/meat and stir it for a while
Step 4: -pour in the pasta sauce plus your noodles
Step 5: -add some salt and herbs.
Step 9: you can replace noodles with anything else available. Pasta, rice, bread, whatever. Any leftover will do.
Step 11: you can also add cheese, mayo, ketchup, whatever and it’ll still be ok. (as long as you like it)
Step 13: just basically throw anything in and enjoy! 🙂