Portobello mushrooms stand in for meat patties in this recipe for veggie burgers with all the fixings. Mushrooms are a source of glutamate, a naturally occurring compound that gives the fungi their umami flavor. But to really give these "Patties" A savory boost, we brush them with steak sauce. Add a simple side salad or some grilled veggies for a satisfying and easy dinner on the grill.
