Number 1 German Slaw

Shred cabbage and carrots finely and place them in a large heatproof bowl with sliced onion.

Bring vinegar, oil, sugar, celery seed, dry mustard, salt, and pepper just to a simmer.

Pour the hot dressing over the vegetables and toss until the cabbage begins to soften.

Cover and chill for several hours so the sweet-sour flavor penetrates the slaw.

Drain lightly if needed and finish with parsley before serving.