Finger Jell-o is a dessert made from three packages of dry Jell-o mixed with four envelopes of Knox unflavored gelatin and dissolved in 4 cups of boiling water. After pouring the mixture into a 13-by-9-inch pan and allowing it to cool, it's sliced into small squares for serving.
Any Jell-o flavor, including sugar-free gelatins, can be used to make finger Jell-o, also sometimes known as Knox blocks or castle bricks. A combination of colors, flavors and even sweetened condensed milk can be layered to create special desserts. When layering Jell-o, use small boxes instead of large ones.
Mix one package of Jell-o with one envelope of unflavored gelatin in 1 cup of water. Once the gelatins have dissolved, pour them into a 13x9 inch pan and set in the refrigerator until cooled. Each gelatin layer cools in 45 minutes to an hour.
To create a white layer, mix one can of sweetened condensed milk with 1 cup of hot water until thoroughly combined. Stir two envelopes of unflavored gelatin into one cup of hot water. Add the gelatin and water mixture to the condensed milk mixture, and stir constantly to prevent setting.
Once the first Jell-o layer has set, pour 1 cup of the white layer on top, and place it back into the refrigerator. Create additional flavored Jell-o mixtures in the desired colors, and layer one on top of the other, allowing each layer to cool completely before adding the next. Add 1 cup of the white layer in between each colored Jell-o layer. Slice into small squares.