In a large Mixing Bowl, whisk together the 2 cups harina de trigo común más para espolvorear and ¼ tsp sal. Pour in the boiling water gradually while stirring with a fork or chopsticks. Mix until shaggy, then turn out onto a lightly 2 cups harina de trigo común más para espolvorear dusted surface and knead for 8–10 minutes until smooth and elastic. The dough should feel soft but not sticky.

Shape the dough into a ball, cover with a damp towel or Plastic Wrap, and let it rest at room temperature for at least 30 minutes. This relaxes the gluten and makes it much easier to roll thin.

Place the finely chopped 1 cup repollo napa finamente picado in a Mixing Bowl, toss with a pinch of ¼ tsp sal, and let sit for 10 minutes. Then squeeze out as much liquid as possible using your hands or a clean towel — this is key to preventing a watery filling.

In a large Mixing Bowl, combine the ground 1 lb cerdo molido proporción de grasa 80/20 preferida, drained 1 cup repollo napa finamente picado, 3 cloves ajo picado, 1 tbsp jengibre fresco finamente rallado, 3 stalks cebolla verde finamente cortada, 2 tbsp salsa de soja, 1 tbsp aceite de sésamo tostado, Shaoxing wine, 1 tsp azúcar, ½ tsp pimienta blanca molida, and ¼ tsp sal. Mix vigorously with a fork or your hand in one direction for about 2 minutes until the mixture becomes slightly sticky and cohesive. Cover and refrigerate until ready to use.

To test the seasoning, cook a small piece of filling in a Skillet or Microwave for 30 seconds, taste, and adjust ¼ tsp sal or 2 tbsp salsa de soja as needed before wrapping.

Divide the rested dough in half. Roll one half into a log about 1 inch in diameter. Cut into roughly 20 equal pieces (about 10g each). Keep the other half covered. Flatten each piece into a disc with your palm.

Using a small Rolling Pin, roll each disc into a circle about 3.5 inches in diameter, rotating the dough as you go. Aim for thinner edges and a slightly thicker center — this helps the dumpling hold together. Keep finished wrappers covered with a damp towel to prevent drying out.

Place a wrapper in your palm. Add about 1 heaping teaspoon (roughly 10–12g) of filling to the center. Fold the wrapper in half over the filling to form a half-moon shape. Pinch the center of the seam to seal, then pleat the front edge toward the center in 3–4 folds on each side, pressing firmly to seal. Place finished dumplings on a lightly 2 cups harina de trigo común más para espolvorear dusted tray, flat-side down. Repeat with remaining wrappers and filling.

Heat a large non-stick or Cast Iron Skillet over medium-high heat. Add the oil and swirl to coat. Arrange dumplings flat-side down in a single layer without touching. Cook undisturbed for 2–3 minutes until the bottoms are deep golden brown.

Carefully pour in the ¾ cup agua hirviendo recién sacada del fuego (it will spit!), immediately cover the pan with a tight-fitting lid, and reduce heat to medium. Steam for 6–7 minutes until the ¾ cup agua hirviendo recién sacada del fuego has fully evaporated and the dumpling skins look translucent and cooked through.

Remove the lid and cook for another 1–2 minutes to re-crisp the bottoms and evaporate any remaining moisture. Slide a thin Spatula under the dumplings to loosen and transfer to a plate, crispy-side up.

While the dumplings cook, stir together the 2 tbsp salsa de soja, 1 tbsp vinagre de arroz, 1 tbsp aceite de sésamo tostado, and optional chili oil and 1 tbsp jengibre fresco finamente rallado in a small Mixing Bowl. Taste and adjust to your preference.

Serve the dumplings immediately, crispy-side up, with the dipping sauce on the side. Work in batches if needed, adding more oil and ¾ cup agua hirviendo recién sacada del fuego for each batch.