"BFF" Beef burger with Molten Mozzarella, basil, beefsteak tomato & caramelized red onion remoulade.

Ingredients

• olive oil, 3 tablespoon
• red onion, large, halved & sliced thin
• brown sugar, 2 tablespoon
• balsamic vinegar, 3 tablespoon
• black pepper, course grind, .25 teaspoon
• ground beef chuck, fresh, 2 pounds
• olive oil, 1 tablespoon
• ground black pepper, .5 teaspoon
• kosher salt, .5 teaspoon
• mozzarella, fresh, 6 each 1 ounce pieces
• mayonaise, .25 cup
• dijon mustard, 2 tablespoon
• dill pickle spear diced, 3 each
• basil leaves, washed, whole, 18 each
• beefsteak tomato slices, large, 6 each
• kosher salt, .25 teaspoon
• course grind black pepper, 1/8 teaspoon
• extra virgin olive oil, .5 teaspoon
• lemon fresh whole zested, 2 teaspoon
• sourdough hamburger buns, 6 each