Burger:

1. Preheat your skillet to medium-high heat.
2. Weigh your portion of ground beef and shape into two patties. Season both sides of each patty with salt and pepper.
3. Place the patties on the skillet and cook for 3-4 minutes per side or until they reach your desired level of doneness. During the last minute of cooking, add caramelized onions and slices of cheese to each patty and let it melt.

Sauce:

1. Start by dicing the onions and adding unsalted butter to a small saucepan over medium heat.
2. Add in the onions once the butter is bubbling along with a pinch of sugar and salt.
3. Cook over medium heat for 30 minutes.
4. In a medium bowl, combine and whisk together mayo, ketchup, finely chopped chives, worcestershire sauce, and a pinch of salt.
5. Add finely diced dill pickles and caramelized onions. Mix together.

Assembly:

1. Toast one side of bread with butter.
2. Spread the sauce on the bottom half of each bun.
3. Add a patty with melted cheese and onions on top.
4. Spread sauce on the top bun.
5. Finish with the top half of the bun.