Flaming Marshmallow Jello Shots: Carve out the middle of the marshmallow. Make your Jello using 3 ounces flavored boxed gelatin, 6 ounces water and 6 ounces vodka. Let the Jello cool completely before pouring it into the marshmallow. It should still be liquid, just cooled. Refrigerate until the Jello has set inside the marshmallow. Eat them plain or you can toast them! For a quick effect, dip them in Bacardi 151 and light it on fire.