INGREDIENTS Onions1 tablespoon extra-virgin olive oil1 tablespoon butter2 Medium Sweet Onions, halved and thinly Sliced1 teaspoon balsamic vinegar1/4 teaspoon dried thymeDijonnaise:1/4 cup mayonnaise2 tablespoons Dijon mustard1 garlic clove, mincedBurgers:1 1/2...