Raw pineapple juice will prevent gelatine from setting as it contains bromelain, an enzyme that breaks down protein. If you want to make pineapple jelly, you must cook the pineapple first.

Raw pineapple juice will prevent gelatine from setting as it contains bromelain, an enzyme that breaks down protein. If you want to make pineapple jelly, you must cook the pineapple first.