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Soak the tomatillos in a bowl of cold water to loosen the husks.
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Drain and peel off the husks.
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Place the tomatillos and garlic in a saucepan with enough water to cover.
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Bring to a boil and cook until the tomatillos are soft, about 10 minutes.
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Transfer the garlic and tomatillos to a blender and puree.
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Heat the oil in a medium saucepan over medium heat.
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Add the pureed tomatillos and the onion and season to taste with salt and pepper.
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Bring to a simmer, and simmer about 10 minutes.