Have you ever made the Jell-o Jiggler recipe on the back of your Jell-o box only to be disappointed because it just wasn’t solid enough to cut? Well, here is secret you all have been waiting for… Knox Gelatin! Finger Jell-O 3 small boxes of Jell-O 4 envelopes of Knox gelatin (the secret!) 4 cups boiling water Whisk all together in a 13×9 pan (no cleanup) and refrigerate until firm. Before cutting, dip the bottom of your pan in warm water.