Prep: Crush garlic under a knife and peel. Lightly pound chicken breasts to even thickness with meat pounder or heel of your hand. Snap off woody ends of asparagus.

1. Mix lemon juice, 1/3 cup olive oil, mustard, herbes de Provence, garlic, ¼ teaspoon salt, and ¼ teaspoon freshly ground pepper in 1-quart zipper-seal plastic bag. Add chicken, close bag, and refrigerate while preparing barbecue grill, but no longer than 30 minutes or so. In another plastic bag, toss asparagus with remaining 2 tablespoons olive oil.

2. Build a hot fire in a barbecue grill (or preheat gas grill on high). Spread coals in a bank, with a double thickness of coals on one side of grill and a single thickness on the other. (On a gas grill, keep one burner on high and the other on low.) Lightly oil grill grate. Grill chicken over the hot, thick bank of coals (high burner), until the underside is seared with brown grid marks, about 2 minutes. Turn and repeat on the other side, about 2 minutes more. Move chicken to the cooler, thin bank of coals (low burner). Grill until chicken feels firm when pressed in the center, about 10 minutes.

3. After chicken has grilled for 5 minutes, arrange asparagus over hot coals (high burner), with spears perpendicular to grid so they don’t fall through. Grill, rolling asparagus occasionally on grid to turn and cook evenly on all sides, until crisp-tender, about 5 minutes depending on thickness of asparagus. Use a metal spatula to transfer asparagus to platter. Season asparagus with salt and freshly ground pepper to taste. Transfer chicken to platter and serve.