I ahve a feeling grilling it would dry iot out and make it a bit tough... I would enjoy it just steamed, but I understand that your DP might not be so keen. The simplest way to dress it would be a squeeze of lemon juice and a sprinkle of salt and pepper.

Other ideas to make it not plain-

Sprinkle with any spice mixes you've got, eg cajun or moroccan, etc.
Make some herbed butter with just a tiny bit of butter and chopped mix of whatever you've got - chives, parsley, oregano, etc. Or butter and mint, which is also a delicious dressing on carrots or peas.
Steam it, then top with a mix of breadcumbs, fine parmesan cheese and sesame seeds, then grill just enough to crisp the top slightly.
Steam it, then rub it in the dropped off bits of garlic from the vegies you grilled.
Steamed with a yoghurt and herb (any of those above) mix as a dip on the side or a splodge on top. Add salt, pepper and lemon juice to the yoghurt mix if you like.
HTH.