An easy way to do red cabbage.
Using a sharp knife slice thinly the cabbage and set aside.
Put oil, onion, red cabbage, salt, sugar and vinegar into a large heatsafe glass bowl. Cover with a vented lid and microwave on high for 4-5 minutes.
Carefully uncover and stir the cabbage. Cover again and cook, stirring every 5 minutes, until the largest parts of the cabbage are wilted and tender, 10 to 15 additional minutes.
Season the cabbage with salt, pepper.
Serve it warm or cold.