Slice the rye bread thinly.
Wash Yanggeundang cabbage thoroughly and julienne it.
Season the julienned cabbage with salt, sugar, and vinegar, and let it sit for 10 minutes.
Mix olive oil and pepper into the cabbage râpée.
Place the cabbage râpée on top of the rye bread.
Add cheese or ham as desired.
Cover with another bread slice to complete the sandwich.