Season 300g of ground Korean beef with 1/2 tsp pepper and 1/2 tsp salt.

Shape the beef into thick burger patties, approximately 2cm thick.

Heat a pan with 2 tbsp olive oil and 1 small piece of butter over low heat.

Cook the patties in the pan, flipping only once after one side is fully cooked.

Transfer the patties to a grill or use a torch to add a smoky flavor.

Place 2 slices of cheddar cheese on each patty and cover with a lid to melt the cheese.

Mix 1 tbsp mayonnaise and 1 tbsp sriracha sauce to create a spicy burger sauce.

Spread the sauce on one side of the burger buns. Optionally, add 1/2 tbsp mustard.

Layer lettuce, onion slices, tomato slices, chicory leaves, and the beef patty with melted cheese on the bun.