Blue Cheese Burgers with Apple Caramelized Onions - Martinelli's

Ingredients

• Caramelized Onions:
• 1 Tbsp unsalted butter
• 1 Tbsp canola oil
• 1 medium onion, cut into ¼"–⅛" thick slices
• 1/4 cup Martinelli's Apple Juice
• Blue Cheese Burgers:
• 1 1/2 lbs lean ground beef
• 2 oz blue cheese, crumbled (plus more for topping, if desired)
• 1 tsp Worcestershire sauce
• 1/4 tsp ground black pepper
• 1/2 tsp kosher salt
• 1/2 tsp dry mustard
• 4 hamburger buns or brioche buns, halved and toasted