Mix flour and salt in a bowl. Pour in boiling water slowly, while mixing with a fork, until all the water is absorbed. Pour in cold water and mix with your hands until the flour has been incorporated. Turn out mixture onto a clean surface and knead until smooth, about 5 minutes. Cover dough with a piece of plastic wrap and let it rest for 20 minutes.
Divide dough into 4 equal pieces. Lightly grease your work surface. Working with 1 piece at a time, roll out dough into a thin rectangle. Brush with melted chicken fat and sprinkle with 1/4 cup scallions. Starting on the long edge, roll dough into a rope. Roll the rope into a coil and tuck the end underneath. Press down with your hand to flatten slightly, and set aside. Repeat with the remaining dough and scallions.
Lightly grease your work surface to prevent sticking. Roll each dough coil into a circle, about 7 inches in diameter.
Heat a cast iron skillet over medium-high heat and add enough vegetable oil to cover the surface of the pan. Add 1 pancake to the hot oil and fry for 1 minute. Flip and fry for 1 more minute on the other side. Continue to cook, flipping regularly, until each side is evenly browned, pressing down with a spatula if necessary to ensure even browning. Remove to a cutting board to cool. Repeat with the remaining pancakes. Serve warm.
You can use another oil instead of melted chicken fat for brushing pancakes.
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