Onions usually play a secondary role in most dishes. Maybe you dice them so they're really small or you don't use too much. In this dish, the onions are just another vegetable.
Of course, you can add as much salt and pepper as you like, but I think these are good with a generous kick of black pepper.
1 tablespoon butter
1/2 pound mushroom, sliced
1 onion, quartered and sliced
1 small zucchini, cut in half lengthwise and sliced
Juice of 1 Meyer lemon
Salt and pepper, to taste
Heat a saute pan on medium-high heat and add the butter. Add the mushrooms and cook until they are browned in spots.
Add the onions and cook until they soften.
Add the zucchini, Meyer lemon juice, salt, and pepper and cook until the zucchini is beginning to soften and the liquid is gone.
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