Grilled Portabella Sandwiches with Tomatoes, Mozzarella & Basil

Ingredients

• 2 Tbs. balsamic vinegar
• ½ cup lightly packed fresh basil leaves (about ½ oz.)
• ¼ cup mayonnaise
• ¼ cup freshly grated Parmigiano-Reggiano (½ oz.)
• 1 Tbs. minced garlic (3 to 4 medium cloves)
• ¼ cup extra-virgin olive oil
• Kosher salt and freshly ground black pepper
• + 5 more ingredients
• • Vegetable oil for the grill
  • 4 large portabella mushrooms, stems and gills removed and discarded and caps wiped clean
  • 4 to 8 thin slices fresh mozzarella or sharp provolone
  • 4 good-quality sandwich rolls, cut in half
  • 2 medium ripe tomatoes, sliced (about 9 oz.)

Heat a gas grill with all burners on high. Clean and oil the grate. In a small bowl, mix the mayonnaise, Parmigiano, and 1 tsp. of the garlic; spread the mixture over the cut sides of each roll. In another small bowl, whisk the olive oil, vinegar, and the remaining 2 tsp. garlic. Brush the oil ...

View full recipe at Fine Cooking