This flavorful, vegetarian burger is packed with protein and fiber from black beans and quinoa. Pair with a filling salad on the side, like this Broccoli and Spinach Salad , for a satisfying, meatless meal. These are great to make ahead and freeze—after forming the patties, lay them out on a baking sheet and pop them in the freezer. Once they are frozen solid, you can take them off the sheet and store them in a freezer-safe bag.