The Classic California Cheeseburger With Caramelized Onions

1. Preheat grill to medium or oven to 375 degrees F.
2. Cut a rectangle of heavy-duty foil, or two layers of regular foil into about a 10-inch square. Places onion slices in the center of the foil square. Toss with seasoned salt and dot with the butter cubes. Bring the edges together and crimp into a package, leaving a small opening for steam to escape. Place on the grill or on a tray in the oven and cook for about 50 minutes, shaking the package occasionally to stir the onions. After removing the package from the heat, open carefully to allow the steam to escape. (May also caramelize the onions in a skillet on the stovetop.)
3. Meanwhile, when about 10 minutes remain on the onions’ cook time, season the beef patties with salt and pepper and place on the grill grates. Cook about 3 to 5 minutes per side and top with cheese slices in the last couple of minutes, just until the cheese melts and the burgers reach 145 degrees F. Remove from grill and let rest.
4. Lightly grill or toast buns if desired.
5. Spread bottom buns with mayonnaise or mustard if using, add the burgers and melted cheese, then top with lettuce, caramelized onions, avocado slices and the top bun. Serve immediately.

Serving Suggestion: Serve with grilled veggies and fresh fruit.

Beverage Pairing: Ice cold beer or water.