"Grilled Portobello mushrooms, peppery arugula and roasted red peppers, served on a toasted bun dressed with our homemade Basil Pesto!..."
INGREDIENTS
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4 Portobello mushroom caps
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1/4 c. olive oil
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Salt and freshly ground black pepper
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1/2 c. mayonnaise
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1 T. prepared pesto
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2 tsp. coarse-grained mustard
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4 hamburger buns
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1 c. baby arugula
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1 (12 oz.) jar roasted red peppers