Smoky Mountain Cheddar and Mushroom Burgers - Sutter Home Family Vineyards

Ingredients

• 1 tbsp butter
• 1 tbsp olive oil
• 1/2 c vidalia onion, finely chopped
• 1/2 c baby portobello mushrooms, finely chopped
• 1 lb ground sirloin
• 1 lb ground chuck
• 3 tbsp plus 2 tsp worcestershire sauce, divided
• 3 tbsp grill seasoning
• 2 tsp hot sauce, divided
• 1/2 c ketchup
• 1/3 c light brown sugar
• 1 tbsp cider vinegar
• 1 tbsp dijon mustard
• vegetable oil for brushing on grill rack
• 6 kaiser rolls
• 6 slices smoked cheddar cheese
• 6 romaine lettuce leaves