Heavy Duty Aluminum Foil Optional, but it makes clean-up easier.
Notes
Alternative Cooking Instructions for Using the Grill
Heat your grill to 425°F and cook the broccolini on it instead. Same timing.
For your convenience, I'd suggest using a grill tray rather than placing the broccolini directly on the grates. You can do so, but you'll just need to take some care when placing them to avoid dropping them into the fire.