Cannelloni With Cheese Sauce

• 6 cannelloni
• 1 onion (chopped)
• 1 freezer bag
• 475 ml marinara sauce prepared as
• 240 ml sauce prepared as (white)
• 110 gr beef browned (ground)
• 80 gr cheddar cheese (grated)
• 65 gr italian sausage browned
• 10 gr parmesan cheese (freshly grated)