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1. In a large skillet, heat 1 teaspoon oil over medium-high heat. Cook spinach until wilted, 2 minutes. Drain, squeeze dry, and coarsely chop. Place in refrigerator for 5 minutes to cool.
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2. In a medium bowl, mix together pork, garlic, ginger, red pepper flakes, and cornstarch. Stir in chopped spinach. Season generously with salt and pepper.
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3. Sprinkle flour on a baking sheet and arrange dumpling wrappers on top. Drop 1 teaspoon of pork filling in center of each wonton wrapper. One by one, brush edges of the wonton wrappers with a bit of water. Fold them in half and gently pinch the edges together, then crimp. Transfer finished dumplings to a parchment-lined baking sheet.
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4. Continue wrapping and crimping dumplings and cover them with moist paper towels so they don't dry out.
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5. Heat 1 tablespoon oil in a large skillet over medium-high heat. Place half the dumplings in skillet and sear until nicely browned, about 1 minute. Tip dumplings over and add 1/2 cup water; place lid on dumplings and let steam until skillet is dry, 3 to 4 minutes. Transfer to a plate and cook remaining dumplings.
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6. In a small bowl, whisk together soy sauce, rice vinegar, and sesame oil.
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7. Serve dumplings, garnished with green onions, with dipping sauce.