Serving: 4Ingredients for the sauce:½ cupvegan mayonnaise1 tablespoon Dijon mustard2 tablespoons beet horseradish, red horseradish, or plain horseradishSalt and pepper, to tasteFor the burgers:4 gluten-free burger buns2 tablespoons oil1 large eggplant, diced1 cup onion, diced1 cupvegan cheese shreds1 tablespoon minced garlic1 tablespoon chopped parsley1 cup gluten-free breadcrumbsSalt and pepper, to tasteFor the toppings:1 cup red onion, sliced2 tablespoons agave...