- Combine flour, salt, and boiling water in a large bowl and stir to combine until a mass of dough forms. Transfer dough to a lightly floured surface and knead until smooth, slightly tacky ball forms, 3 to 4 minutes.
- Transfer dough ball to a medium bowl and cover with a kitchen towel or plastic wrap. Let rest 30 minutes at room temperature, or up to overnight in the refrigerator.
- In a small bowl, combine 2 tablespoons vegetable oil and sesame oil.
- Once the dough has rested, separate into four equally sized balls. Return three to bowl and recover with kitchen towel or plastic wrap. Roll out the ball on a lightly floured surface as thinly as possible, 8-10 inches and brush with a thin layer of the oil mixture. Top with ¼ of the sliced scallions. Roll dough away from you into a tight, thin cylinder, like a jelly roll. Starting at one end, form into a coil, like a cinnamon roll. Using a rolling pin, roll out dough again to form a pancake about 8-10 inches. Repeat with the remaining dough.
- Add ¼ cup vegetable oil to a skillet over medium-high heat until shimmering and gently add first pancake. Cook, undisturbed, until golden on one side. Flip and cook until golden on underside, about 2 to 3 minutes per side. Remove to paper-towel lined plate. Repeat with the remaining pancakes, adding more oil if necessary.
- Combine the ingredients for dipping sauce and pour into small serving bowl
- Cut the pancakes into quarters (triangles) and serve with dipping sauce.