Portobello Burgers with Avocado Mayonnaise

Description
Makes 6 servings

Ingredients

 * 6 portobello mushroom caps
 * 2 red bell peppers, seeded and halved
 * 1 purple onion, cut into ½-inch thick slices
 * all natural PAM garlic flavor cooking and seasoning spray
 * 6 hamburger buns
 * 3 small California avocados, peeled and sliced

Avocado mayonnaise

 * 1 small California avocado, peeled and chopped
 * ½ cup mayonnaise
 * 2 tablespoons lemon juice
 * ¼ cup fresh basil leaves
 * 1 garlic clove, minced

Directions

 * 1) Coat mushrooms, bell pepper, and onion with cooking spray.
 * 2) Grill onion in a Weber charcoal or gas barbecue, covered with grill lid, over medium-high heat (350 degrees to 400°F) 8 minutes on each side.
 * 3) Grill mushrooms 5 minutes on each side.
 * 4) Place bell pepper skin side down and grill for 4 to 5 minutes.
 * 5) Peel bell peppers and cut into strips.
 * 6) Spread avocado mayonnaise on cut sides of buns; place on cooking grate, and grill 1 minute.
 * 7) Place mushrooms, bell pepper strips, and onion evenly on bottom halves of buns.
 * 8) Top evenly with avocado slices and bun halves.

Avocado mayonnaise

 * 1) Process all ingredients in a food processor until smooth, stopping to scrape down sides.
 * 2) Cover and chill 2 hours, if desired.