"This diner classic gets a makeover by replacing some of the ground beef with finely chopped portobello mushrooms, which add moisture and flavor. We like a smear of pickle relish on top, but you could try chutney, mustard or hot pepper relish in its place. Make it a meal: Round out the plate with Oven Sweet Potato Fries and Balsamic and Parmesan Roasted Cauliflower...."