My friend, Jennifer came up with the ingredients because most, if not all of us, love Fireball. I simply put them together. We found some like these less strong and the rest like them at full strength. I make 2 batches to accommodate everyone's taste. So far, we have gotten great reviews on the Green Apple Pie Shots. They love the tartness of the green apple gelatin with the sweet heat of the Fireball cinnamon whiskey.