Best way to grill broccoli and cauliflower? Want it as a side for grilled chicken.

Thanks!

i usually marinade them in olive oil & herbs/spices, and layer them on a baking sheet to roast at 400 F.

I blanch quickly then dry and toss with olive oil and any herbs I may want to season. Then put on grill ...indirect heat till almost done, on direct heat to finish and get grill marks/char flavor.