You can shape the patties slightly thinner (though I wouldn't go thinner than 1/2-inch) and then shallow-fry them to turn this into a vegan hamburger patty. You can skip the broth, but I would suggest glazing the patties with teriyaki sauce. To do this, boil equal parts soy sauce, sake, and sugar until it's thick and bubbly. Then add the fried patties into the sauce and flip them around a few times until they are glazed with the sauce. Then you can assemble your tofu burger as you like.