1Mix garlic, water, Dijon, vinegar, herbs, olive oil and Worcestershire sauce in small bowl. Place in a large resealable bag remove stems from mushroom caps add to marinade.Turn a few times to coat and allow to marinade for 30 minutes to 1 hour. Season with salt and pepper. Grill or broil the mushrooms on medium heat, turning often, until tender, about 5 minutes on each side. Baste with marinade to keep from drying out. Using tongs, transfer the mushrooms to a plate. Toast rolls on grill or under broiler. Place cheese on mushrooms. Serve on buns slathered in mustard and mayo. Top with lettuce,tomatoes,onion and avocado,if using. Serve with dill pickle spears.