Stuffed Portobello Burgers

Ingredients

• 6 portobello mushrooms
• 6 slice from 1 large red onion
• 6 tbsp. extra-virgin olive oil
• 1 loaf ciabatta bread
• 2 tbsp. balsamic vinegar
• 1 clove garlic
• ½ tsp. each salt
• ½ tsp. Freshly ground pepper
• 12 oz. Fontina cheese
• 18 large leaves fresh basil
• 6 slice beefsteak tomato

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