Food and Recipes Dish Sandwich Turkey Grilled Cheese Recipe with Gruyere and Caramelized Onion 5.0 (1) 1 Review We're loving this turkey grilled cheese recipe for our leftover thanksgiving turkey. Take the all-American grilled cheese sandwich to a whole new level with the addition of caramelized sweet onion. This is a powerful way to add great flavor to burgers, homemade pizzas, soups, grilled meats, and just about anything. Here's a quick tutorial on caramelizing onions: Heat a dab of olive oil in a skillet and add diced or sliced sweet onions. Cook, stirring occasionally, until onions begin to turn golden and liquid has evaporated. Continue to cook until onions develop a deep golden-brown color. By Marianne Williams Marianne Williams Marianne Williams is a recipe tester and developer who has been working in the Dotdash Meredith test kitchens since 2016. Her recipes are featured in Food & Wine, Southern Living, Real Simple, Rachael Ray, Health, Cooking Light, and in various other publications and digital platforms. Southern Living's editorial guidelines Published on October 16, 2018 Print Share Share Tweet Pin Email Photo: Victor Protasio; Prop Styling: Lindsey Lower; Food Styling: Chelsea Zimmer Yield: 1 sandwich Ingredients 2 teaspoons whole grain mustard 2 slices sourdough bread 2/3 cup shredded Gruyère cheese, divided 2 1/2 ounces sliced roasted turkey 1/4 cup caramelized sweet onion 2 tablespoons unsalted butter Directions Spread whole-grain mustard on one slice of bread and top with 1/3 cup Gruyèrecheese, turkey, carmelized sweet onions, and remaining 1/3 cup Gruyèrecheese, in that order. Top with remaining slice of bread. Melt butter in a small skillet over medium until beginning to foam. Add sandwich to skillet and cook until first side browned, about 2 minutes. Flip sandwich and cover pan with aluminum foil. Cook until cheese is melted and second side is browned, about 2 more minutes. Serve immediately. Print