Chef’s Notes: Slightly undercooking the lentils and shredding the raw sweet potato gives the burger more structure. The egg is an important binder. If you are vegan, you can swap the egg for a flaxseed egg mixture. When creating the patty, make sure you firmly form them. They are slightly more delicate than a normal meat patty. If you cannot find Thai basil, Italian basil works well. Whole wheat buns give this burger a nutty flavor that is ideal.