Portabella, California Avocado and Pepper Jack Sandwich - California Avocados

Ingredients

• 24 Portabella mushroom caps (2 ounces each)
• As needed Olive oil - as needed
• As needed Salt and coursely ground black pepper - as needed
• 2 1/4 cups mayonnaise
• Lemon juice, divided - 3 tablespoons + 1/4 cup
• 4 lb. California Avocados
• 24 Round sandwich buns
• 24 Pepper Jack cheese, sliced (1-ounce slices)
• 24 Lettuce leaves
• Tomato - 24 large and thin slices