Burger:

1. Preheat your grill or skillet to medium-high heat.
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 in the skillet and cook for 3 minutes, and flip.
4. Cook for 3 minutes and turn off heat. Add butter, garlic, and thyme. Use a spoon to baste the patty with the butter.
5. During the last minute of cooking, add a slice of cheese to the patty and let it melt.
6. Take the patty out of the pan and rest on a wire rack.

Assembly:

1. Toast buns.
2. Spread the sauce on the bottom half of each bun.
3. Add a patty with melted cheese on top.
4. Add lettuce, tomato, and onion.
5. Spread mayo on the top bun.
6. Finish with the top half of the bun.