guaca-cheddar burgers - Sutter Home Family Vineyards

Ingredients

• 1 medium sized white onion chopped
• 1 tbsp. butter
• 1 lb. ground chuck
• 1 tsp. salt
• 1 tsp. pepper
• grilling spray
• 2 small avocados
• 2 tsp. fresh lemon juice
• 2 tsp. chopped fresh cilantro
• 1 cup shredded sharp white cheddar cheese
• 4 kaiser rolls
• 4 tbsp. melted butter