Burger:

1. Preheat your oven to 250°F.
2. Weigh your portion of ground beef and shape into a patty. Season both sides of the patty with salt and pepper.
3. Place the patty on a baking tray on the middle rack of the oven. Cook for 20 minutes or until the temperature internally reads 120°F.
4. Remove the tray from the oven and preheat a cast iron over medium-high heat.
5. Place the patties in the pan and cook for 2 minutes per side or until they reach your desired level of doneness.
6. During the last minute of cooking, add a slice of cheese to each patty and let it melt.

Burger Sauce:

1. In a small bowl combine all ingredients. Use a whisk to mix thoroughly.

Assembly:

1. Toast buns.
2. Place the bun heel on plate.
3. Spread the sauce on the top half of the bun.
4. Add the patty on top.
5. Finish with the top half of the bun.