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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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).