Marinated mushrooms -- Something different as an additional item.

Fresh mushrooms, cleaned and trimmed. Overnite marinate, in sealed
container, tossed adn coated (not swimming in!) a bit of olive oil, a
flavored vinegar, a few onion half-rings (raw), perhaps a touch of
garlic powder (not much!) and your favorite green herb (basil, dill,
rosemary -- just one, but they're all different).

Before serving, drain through a colandar, but do not rinse. I'm
lazier, I just use a slotted spoon to lift them from the plastic
marinade container into he serving dish. A toothpick in each, if you
wish. Or just a teaspoon in the bowl for guests to get them onto their
plates.

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ANOTHER: Corn Relish

Use frozen corn from the bag (not canned, that's cooked). The corn
will defrost by itself while preparing and carrying.

Toss with finely chopped red and green bell pepper, perhaps onions.
No marinade for this; the key is fresh taste. Perhaps some parsley
for color. That's all.