Grilled SPAM®, Tomato, Cheddar Cheese, and Sweet Onion Sandwiches

Details

Ingredients

• ¼ cup spicy brown mustard
• 8 slices whole wheat bread
• 1 (12 ounce) can fully cooked luncheon meat (such as SPAM®), cut into 1/4 inch slices
• 8 slices Cheddar cheese
• 2 large tomatoes, cut into 1/2-inch slices
• 1 sweet onion, thinly sliced
• ¼ cup softened butter