The Krabby Patty is the popular burger served at the Krusty Krab. It is the most famous food in Bikini Bottom and Bikini Bottom citizens's favorite food. It is a basic plot element that contributed to the Krusty Krab's existence. The Krabby Patty is made out of a frozen hamburger with fresh seaweed lettuce, crisp onions and tomatoes with undersea cheese, pickles, mustard, ketchup, and with a secret formula. This secret formula has never been revealed in the series. In the episode "Just One Bite," Krabby Patties are revealed to be kept in the Patty Vault. The Krabby Patty was made by Eugene H. Krabs and Plankton when both was kids.