Freeze vegetable scraps like celery trimmings, onion and carrot skins, or things that are going a bit off.

When you have enough…. Stock.

Also keep the carcass from breaking down whole chickens. (Chicken stock.)

You can get jumbo ice cube molds and freeze it in half-cup blocks.

i started freezing tomato sauce and tomato paste (they go bad quite fast?!), in their original glass container, but was really annoyed by having to get it out of the freezer hours before you need it. Otherwise you won’t get it out of the glass, or you have to warm it up…

Now i’m putting the sauce and paste into a ice cube tray, works quite good so far.