Final answer:
For a bunless burger or burger bowl, bottom bun toppings are mixed in with the other ingredients in the bowl to maintain the traditional burger flavors and structure, catering to dietary preferences like low-carb or gluten-free.
Step-by-step explanation:
When preparing a bunless burger (also known as a burger bowl), the components typically placed on the bottom bun in a traditional burger are rearranged within the bowl. Instead of being stacked, ingredients like lettuce, tomatoes, onions, pickles, and condiments are mixed together below or aside the burger patty. The concept is to maintain the flavors and structure of a classic burger but without the bread, usually for dietary preferences such as low-carb or gluten-free diets.