Cut or tear the green cabbage into large pieces.Note: Mom prefers to tear vegetables like lettuce or cabbage to give it a natural and appetizing look. She also says it tastes better.
Add the cooking oil to the pan and adjust the stove to high heat as you chop the jalapeño, garlic, and green onions.
When the pan is hot, add the jalapeño and garlic and stir for about 20 seconds. Add the green cabbage and stir for 1 minute.
Add vinegar and sugar and continue to stir until the cabbage looks about halfway cooked and has reduced in size. Add in the shoyu and stir for another minute to let the shoyu cook. Turn off the stove and add the green onions for some color.