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1
Warm the safflower oil in a wide, heavy skillet over medium-low heat. Add onion and garlic and cook gently until softened and translucent, 3–4 minutes.
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2
Add the tomatoes and chiles serranos. Cook over medium heat, stirring occasionally, until the mixture reduces to a rough, thickened sauce, about 5–8 minutes.
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3
Add the zucchini cubes and sea salt. Stir to coat. Cover the pan and cook 5 minutes.
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4
Remove the lid. Raise heat to high and cook, stirring frequently, until the liquid is fully absorbed and the zucchini cubes are well seasoned and lightly glazed. Serve immediately.