Pirate Burgers - Sutter Home Family Vineyards

Ingredients

• 6 slices pineapple from a 20 ounce can, canned in its own juice, drained, reserve juice
• 1/8 cup + 1 Tablespoon high quality dark rum
• 1 Tablespoon dark brown sugar
• 1 Tablespoon vegetable oil to grease grill
• 2 pounds ground beef, 75% lean
• 1-1/2 teaspoon salt
• 1-1/2 teaspoon ground black pepper
• 2-1/2 teaspoons Tamari or soy sauce
• 4 teaspoons fresh ginger, grated (microplaned)
• 2 Tablespoons + 1-1/2 teaspoons reserved pineapple juice
• 3 extra large sweet onions (Vidalia or Walla Walla)
• 1 Tablespoon margarine
• 1 cup mayonnaise
• 1-1/2 teaspoons dry mustard
• 6 fresh soft burger buns