What is a flying dutchman at in and out?

The Flying Dutchman at In-N-Out is a secret menu item that consists of two beef patties, two slices of cheese, and two slices of In-N-Out's famous grilled onions, all sandwiched between two grilled cheese sandwiches instead of traditional burger buns. This decadent and indulgent creation has become a popular choice among In-N-Out enthusiasts who are looking for a unique and satisfying meal. It is not officially listed on the menu, so you may need to ask for it specifically when ordering.