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Wash spinach carefully and discard stems and any tough outer leaves. You can use bagged,cleaned spinach.
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Clean the mushrooms by brushing off any dirt w/ towel or mushroom brush. Cut into thick slices and set aside.
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drain spinach and place in a large saucepan.
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Add 2 or 3 pinches of salt and nutmeg. Cover and cook over medium heat, turning the leaves a couple of times, until just wilted, about 2 minutes.
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Drain in a colander and press the leaves with the back of a spoon to removeall excess liquid.
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Return to pan and fluff up the leaves.
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Cover on a plate to keep warm.
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Melt butter in a large saute pan or frying pan over medium heat.
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Add the onion and cook until translucent, about 2 minutes.
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Add the mushroms, raise the heat to high and stir and toss until just tender, 3 to 4 minutes (cook the mushrooms in batches if you need to).
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Season to taste with salt, nutmeg and a squeeze juice from one lemon. Toss well.
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To serve, spoon the mushrooms in the center of a shallow serving dish or platter. Surround with the spinach. Cut remaining lemon for garnish.