How to Make It
Combine all Marinade ingredients in a 1-gallon ziplock plastic freezer bag. Add all Vegetables. Gently massage bag until all vegetables are coated in marinade. Seal bag, squeezing out excess air. Lay bag flat on a small rimmed baking sheet, and place in refrigerator. Chill 2 hours, turning bag once or twice.
Remove from refrigerator, and let stand 20 minutes.
Preheat grill to medium-high (400°F to 450°F). Remove vegetables from bag, reserving marinade. Season with salt and pepper to taste, if desired. Grill Broccolini and bok choy, uncovered, until tender-crisp and grill marks appear, about 5 minutes per side. (You may need to turn more often, since the vegetables are delicate.) Drizzle grilled vegetables with reserved marinade.