Grilled Portobello Mushroom Sandwiches with Basil Aioli Recipe

Ingredients

• 4 large caps Portobello mushrooms
• 4 tablespoons Olive oil
• 2 tablespoons Balsamic vinegar
• 2 minced Garlic cloves
• 1 teaspoon Salt
• 0.5 teaspoon Black pepper
• 0.5 cup Mayonnaise
• 0.25 cup Fresh basil leaves
• 1 tablespoon Lemon juice
• 4 pieces Rustic sandwich rolls or ciabatta bread
• 4 large Tomato slices
• 1 cup Baby spinach or arugula
• 4 slices Red onion rings