Beefie Lamb Burger - Sutter Home Family Vineyards

Ingredients

• 1 1/2 lb lean beef
• 1/2 lb lamb
• 1/2 cup dices red onion
• 1/2 cup crimini mushroom
• 2 large eggs
• 1 tsp black pepper
• 1 tsp salt
• 6 slices smoky fontinia cheese
• 6 large onion buns
• mayo
• ketchuop
• Dijon mustard
• 6 large tomato slices
• 12 leaf of leaf lettice