Chop the cabbage up into bite size slices.
Dice the garlic and grind the mustard seeds if you have whole seeds. The fresh ground mustard really makes a difference in flavor.
Chop the parsley and basil.
Place your oil in a bowl, add the mustard, garlic, herbs, vinegar and salt and pepper to taste. Basically you’re making a dressing for the cabbage.
Put cabbage and dressing in a bowl toss together covering all the cabbage.
Place in refrigerator for 30 minutes if you have the time. If not you can go straight to grilling, make a heavy duty foil grilling bowl/boat for the cabbage mixture to go into and grill on medium for 9-13 minutes.