Some people are making homemade carb-free buns this year.
Lettuce as a bun stands the test of time, and it’s classic for a reason.
Moreover, lettuce can give you fiber, potassium and Vitamins C and K (viaUPMC).

UPMC generally recommends vegetables for buns if you aren’t making your own carb-free buns.
Outside of lettuce, they recommend using portobello mushrooms, eggplants, and even red bell peppers as buns.
One of the most promising vegetables to use as a burger bun is likely the cauliflower.

After all, cauliflower has been proven to be incredibly versatile over the last few years.