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1
Warm the oil in a wide, lidded pan over medium heat. Add the onion, garlic, and serrano with a pinch of salt. Sauté until the onion softens, 3 to 4 minutes.
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2
Add the chayote slices, a few grinds of pepper, and the water. Cover and raise the heat to high. Cook approximately 8 minutes, until the chayote is firm-tender and most of the water has evaporated.
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3
Stir in the natas. Cover and cook over medium heat until the chayote is fully tender and coated in cream. Taste and adjust salt.
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4
Remove from heat. Leave covered and undisturbed for 15 minutes before serving.