Grilled Patty Melt - Sutter Home Family Vineyards

Ingredients

• 1/2 cup light mayonnaise
• 1 1/2 tablespoons ketchup
• 1 heaping teaspoon grated onion
• 3/4 teaspoon prepared white horseradish
• 1/2 teaspoon Worcestershire
• 1 tablespoon sweet pickle relish
• 3 tablespoons vegetable oil
• 6 white onions, sliced
• salt
• pepper
• 1 pound ground sirloin
• 1 pound ground chuck
• 2 cloves garlic, pressed
• 1 1/2 teaspoons kosher salt
• 6 thick slices of swiss cheese
• 12 slices rye bread