Although House of Prime Rib isn’t your typical hangout for vegetarians, people still enjoy going for the exuberant atmosphere and dining experience. Vegetarians can enjoy the savory flavors of this long-time establishment with a grilled vegetable plate from the House of Prime Rib secret menu. This off-menu option is massive, so vegetarian patrons can still leave with a full belly. The plate comes loaded with portobello mushrooms, eggplant, red peppers and zucchini, topped with fresh mozzarella, a pinch of basil chiffonade, and a drizzle of aged balsamic.