Fresh herbs can add a lot of flavour to any dish, especially on the grill. If you buy fresh and have stems left over, don't throw them away, toss them on the grill. They will add a little smoke and some subtle flavour to whatever you're cooking.
For example, the next time you use fresh rosemary or thyme in a marinade for beef or chicken, keep the stems and put them right on the coals when you add your vegetables to the grill. You'll end up with the same flavour undertones throughout all of dishes you prepare on the grill, which will help tie your meal together.
What to Do with Herb Stems [Chef Talk]