Cookwith - Ultimate Brioche Burger with Heirloom Tomato & Arugula

Ingredients

• 1 lb ground beef (80/20 blend)
• 4 brioche burger buns
• 4 slices sharp cheddar cheese
• 1 large heirloom tomato, sliced
• 1 small red onion, thinly sliced
• 1 cup baby arugula
• 2 tbsp mayonnaise
• 1 tbsp Dijon mustard
• 1 tbsp ketchup
• 1 tbsp unsalted butter, room temperature
• Kosher salt and freshly ground black pepper, to taste
• 1 tbsp vegetable oil