I’ll give you two answers here, anonymous: the one my editor would want me to give and the one my editor would actually want me to give.
The one my editor would want me to give: Look Jello dead in the eye as you consume a cup of gelatin. Establish dominance.
The one my editor would actually want me to give: Allow Jello to inspect a cup for itself. You can do this by simply showing it a cup or by allowing it to taste a little. (Gelatin isn’t poisonous to ditto, for the record.) You may even wish to purchase a box of Jell-O mix and make a batch yourself, so Jello can better understand what it is you’re actually eating.
If all else fails, may I suggest switching to fruit snacks instead?