Not quite anything, but almost! You can add:

Cooked and uncooked food waste: Vegetables, meat, dairy, bread, rice, pasta, and even eggshells.

Leftovers: Including those greasy scraps that wouldn’t normally go in a traditional compost heap.

Avoid:

Liquids: Oil, milk, or excessive sauces can interfere with fermentation.

Large bones: These take ages to break down.

Non-food items: Stick to kitchen scraps—no paper, plastic, or garden waste.

Wiggly tip: Chop larger items into smaller pieces to help the microbes do their work more efficiently.