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Recipe from
tablespoon.com
Parmesan-Crusted Grilled Cheese Sandwiches with Caramelized Onions
tablespoon
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Ingredients
Produce
1 Onion, sliced (about 2 cups), large
Condiments
2 tsp Balsamic vinegar
Baking & Spices
1/4 tsp Salt
1/2 tsp Sugar
Oils & Vinegars
1 tbsp Vegetable oil
Bread & Baked Goods
8 slices Sourdough bread
Dairy
1/3 cup Butter
2 cups Cheddar cheese, sharp
1 1/2 cups Parmesan cheese