These veggie burgers are filled with soybeans and served with an Asian-inspired mayo. The fat in the patties, unlike the kind in beef burgers, is largely plant-based and unsaturated ("good") fat.
Put toasted sesame seeds, rice, soybeans, flour, salt, 2 teaspoons soy sauce, and the eggs into a large bowl; season with pepper. Using your hands, gently combine mixture. Shape into 4 patties.
Heat oil in a large nonstick skillet over medium heat. Cook patties, flipping once, until beginning to brown and cooked through, 5 to 6 minutes per side.
Stir remaining teaspoon soy sauce with mayonnaise. Serve patties on buns with lettuce and mayonnaise mixture.