Prepare seaweed sheets for kimbap.
Julienne cucumber and carrot thinly.
Drain canned tuna using a strainer to remove excess oil.
Slice king oyster mushrooms thinly.
Beat eggs and cook into a thin omelet, then let it cool.
Melt butter in a pan and stir-fry the julienned vegetables.
Season the tuna with mayonnaise, salt, and pepper.
Evenly spread low-carb rice or cauliflower rice over the seaweed sheet.
Add the prepared vegetables, egg omelet, and tuna on top.
Roll the seaweed tightly with the ingredients inside.
Slice into bite-sized pieces.