It is also possible to make Jell-OTM with added pieces of fruit. The directions

Question

It is also possible to make Jell-OTM with added pieces of fruit. The directions on the box include the following: "Chill until slightly thickened, then add 1 to 2 cups cooked or raw fruits. Fresh or frozen pineapple must be cooked before adding". If the pineapple is not cooked, the gelatin will not set properly. Pineapple belongs to a group of plants called Bromeliads. Pineapple contains a protease called bromelin. Explain why the pineapple must be cooked and how uncooked pineapple prevents gelatin from setting

Explanation / Answer

Bromelain is a protease basically a type of enzyme. Enzymes are proteinaceous and have an optimal working temoerature, cooked pineapple will have degraded enzyme which can no longer secrete the proteinase. The uncooked pineapple will produce the proteinase inhibiting the gelatin to settle

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