INGREDIENTS
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4 portabella mushrooms
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3 tablespoons balsamic vinegar
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3 tablespoons red wine*
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1/4 cup tomato juice
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3 teaspoons Dijon mustard
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1 1/2 tablespoons Cajun, Italian or other seasoning blend
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2 tablespoons butter
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4 cloves garlic, chopped
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10 ounces fresh spinach leaves
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1/4 cup dried bread crumbs
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1/4 teaspoon salt
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4 slices Cheddar or Swiss cheese (Feta or Blue cheese is also awesome here)
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4 hamburger buns