Until the onions and zuchhini are soft - give it ~10min and double-check because steaming setups vary, but 10min should be good. Zucchini take longer than onions.
(I'd recommend feeding the mushrooms to a dog you don't particularly like, personally - so I'm not good on their cooking times)
Steamed zucchini sounds... bland - but fried with garlic and butter and spices, though, it can be really quite good. Of course, that can also be said of dog food and styrofoam.
A bit of olive oil or vegetable oil. Some salt, fresh ground black pepper, maybe a bit of minced (or powdered) garlic. Toss veggies in, skewer if grilling, just in pan otherwise.
Cooking times will vary somewhat, but I would think that as soon as the onions start to caramelize, you'd have the rest cooked (possibly a touch overcooked, but you have to experiment).
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(I'd recommend feeding the mushrooms to a dog you don't particularly like, personally - so I'm not good on their cooking times)
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But I am utterly unhelpful at times.
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With the onions, it will vary wildly depending on whether you're steaming them whole, halved, sliced, etc.
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A bit of olive oil or vegetable oil. Some salt, fresh ground black pepper, maybe a bit of minced (or powdered) garlic. Toss veggies in, skewer if grilling, just in pan otherwise.
Cooking times will vary somewhat, but I would think that as soon as the onions start to caramelize, you'd have the rest cooked (possibly a touch overcooked, but you have to experiment).