Lettuce Wrapped Mushroom Burger | The Leaf

Ingredients

• 10 oz. baby bella mushrooms, cleaned and stemmed
• 1 cup finely chopped yellow onion
• 1 Tbsp. minced garlic
• ½ tsp. sea salt
• ¼ tsp. freshly ground black pepper, divided
• 8 oz. 90% lean grass-fed ground beef
• 1 tsp. Worcestershire sauce
• 4 slices reduced-fat swiss cheese
• 4 Tbsp. BBQ sauce
• 1 large head iceberg or romaine lettuce, rinsed then dried