Wilson Tang owns Nom Wah Tea Parlor, the longest-running dim sum restaurant in New York City’s Chinatown, and he recently released The Nom Wah Cookbook, which includes recipes for perennial favorites like scallion pancakes. “They’re a classic,” he says. “That flaky texture makes them a light appetizer,” he says.
Make the dipping sauce: Combine the vinegar, soy sauce, sugar and sesame oil in a small bowl and whisk until the sugar dissolves; set aside.
Make the scallion pancakes: Put the flour in a large bowl, then add the boiling water and stir with a wooden spoon until the dough forms a ball.
Turn out the dough onto a lightly floured surface and knead until smooth, elastic and no longer sticky, 4 to 6 minutes. Transfer the dough to a large bowl, cover and let rest 30 minutes.
Preheat the oven to 200˚ F. Divide the dough into 8 pieces, then roll each into a thin 8-inch circle on a lightly floured surface. Brush each circle of dough with 1/2 teaspoon sesame oil and sprinkle with 1 heaping tablespoon scallions; season with 1/8 teaspoon salt. Roll up each circle of dough into a cigar; then, working from one side, roll each into a coil, tucking the ends underneath. Lightly flour the surface again and roll each coil to a 7-inch pancake (1/8 inch thick).
Heat 2 tablespoons vegetable oil in a large skillet over medium-high heat. Add 1 pancake and cook until golden brown, 2 to 3 minutes per side. Remove to a baking sheet and keep warm in the oven. Repeat with the remaining pancakes, adding 1 more tablespoon vegetable oil to the skillet each time and reducing the heat to medium if the pancakes are browning too quickly. Slice the pancakes into wedges. Serve with the dipping sauce.