Stuffed Portobello Burgers with Caramelized Onions

Ingredients

• 1 tbsp butter
• 2 spanish onions, thinly sliced
• 1 tbsp brown sugar
• 1 tsp balsamic vinegar
• 8 portobello mushrooms
• 1 tbsp vegetable oil
• 1/2 eggplant, sliced into thin rounds
• 3 oz roasted red peppers
• 4 oz sliced low-fat mozzarella
• 1 loaf focaccia bread

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