Fire up your grill for direct cooking. You'll want to use a grill vegetable basket.
Trim ends off of the sprouts and cut in half. Remove any bad leaves.
Whisk together remaining ingredients in a large bowl. Add the sprouts and toss gently to coat. Let set for 5 minutes.
Transfer sprouts to a grill basket that has been sprayed with non-stick spray. Transfer to the grill and grill for 5-10 minutes, tossing occasionally, until lightly charred and just starting to soften. I use a long bamboo skewer to poke the sprouts as they cook so I can tell when they are done.
Remove from the grill and serve immediately sprinkled with more salt and pepper as desired.