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Preheat oven to 400°F. Line a big rimmed baking sheet with foil.
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To arrange candy potatoes: Carry 1 scramble of water to a boil in a big saucepan fitted with a steamer basket. Add candy potatoes, cowl and steam till very refined, 15 to 18 minutes. Transfer to a medium bowl. Add milk, butter, salt and pepper; mash till mixed however aloof rather corpulent. Cover to retain warm.
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Within the meantime, put collectively meatballs: Squeeze zucchini in a exquisite kitchen towel to steal away excess moisture. Residing the zucchini in a big bowl and add egg, pork, panko, 1/2 cup onion, 1/3 cup cilantro, salt and pepper. Mix gently with your hands till correct mixed (enact no longer overmix). The utilization of about 3 tablespoons to carry out every, form the mixture into 24 meatballs. Residing 1 scramble apart on the inspiring baking sheet.
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Bake the meatballs till an quick-read thermometer inserted in the guts registers 165°F, about 18 minutes.
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Combine tomatoes, chipotles and garlic in a blender. Blend till refined.
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Warmth oil in a big pot over medium-high warmth. Add the remaining 1 cup onion and chili powder and cook dinner, stirring, till the onion is starting to soften, about 3 minutes. Add the tomato mixture and inform to a boil. Lower warmth to retain a simmer, cowl and cook dinner for five minutes. Scurry in the meatballs, cowl and cook dinner 5 minutes more.
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Divide the candy potatoes among 4 plates. High every with 3 meatballs and 3/4 cup sauce (reserve the remaining meatballs and sauce for another exercise). Sprinkle with cotija and the remaining 3 tablespoons cilantro.
To carry out forward
Refrigerate meatballs (Steps 1-5) for as a lot as about a days or freeze for as a lot as about a months.