New answers tagged gelatin
Generally acids will inhibit the gelling process of gelatin, as I found when I tried to make a lemon jelly once and failed! Pineapple, as well as having its own particular enzymes is also fairly acidic so in your case it was probably this combination of factors. If you are using juice sometimes you can boil it to reduce before adding gelatin and cooling.
As the instructions on the box say, you shouldn't put fresh pineapple (or kiwi-fruit) in the Jell-O. Apparently pineapple has an enzyme called bromelain that breaks up the gelatin into its component amino acids. You can use canned pineapple instead as the pineapple is cooked during the canning process and this denatures the bromelain.
If you pour jello into dishes while it is still very warm, the mixture has time to start layering and separating a bit, leaving the layer you describe on the bottom of the dish. In my experience, the best way to avoid it is to not pour the mixture into the dish/es until it is cooled to nearly room temperature and considerably thicker. While it's cooling, you ...
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