Spread a generous layer of room temperature salted butter on the outside of four slices of fresh sourdough bread.

On the unbuttered side of two slices, layer a slice of sharp cheddar cheese followed by a spoonful of kimchi, and then add a slice of gouda cheese.

Take the remaining two slices of sourdough and press them on top of the sandwiches, buttered sides facing outward.

Preheat a cast iron skillet over medium-high heat for a couple of minutes until hot.

Carefully place the sandwiches in the hot skillet and cook for about 5 minutes on each side.

Once both sides are golden brown and the cheese has completely melted, carefully remove the sandwiches from the pan.

Slice the sandwiches in half and serve warm, enjoying the mix of flavors.