How to Make Homemade Pop Rocks. Ask a child of the 1970s about candies from that era and Pop Rocks will most likely be on the list. The colorful sweets fizz and crackle on your tongue because the sugar granules are gasified with carbon dioxide. Relive the fun by making your own Pop Rocks with basic baking ingredients and citric acid, a white powder extracted from fruits like pineapples, lemons and limes. Sprinkle homemade pop rocks on iced cookies, cakes, cupcakes or cake pops.