Separate the cabbage leaves and wash them thoroughly.
Blanch the cabbage leaves briefly in boiling water, then cool them.
Drain the oil from the canned tuna and place the tuna in a bowl.
Add chopped onion and chopped bell pepper to the tuna and mix well.
Add ssamjang and mayonnaise, then mix everything together evenly.
Place the seasoned tuna on a blanched cabbage leaf and roll it up.
Arrange the finished wraps on a plate.