Chipotle Beef Burgers

Ingredients (10)

• 2 pounds ground beef (80/20%)
• 2 tablespoons pureed chipotle in adobo sauce (see Note)
• ½ teaspoon Kosher salt
• ⅓ cup minced onion
• For the Condiments:
• 2 tomatoes (sliced)
• 1/2 cup onion (sliced)
• 4 lettuce leaves (large)
• 2 tablespoons mustard
• 1/4 cup ketchup