1. Light fireplace
2. Cook pepper in a pot on tripod (Dried, in my case)
3. Put dried pepper inside player's inventory.
4. Put fresh pepper in vincinity and wait.
5. All baked/boiled/dried/burnt pepper inside inventory changes to uncooked model, but their properties like sickness/nutrition remains the same.
6. Even with Inspecting or dropping reversed peppers they will still look fresh.

Have not confirmed for meat