In a bowl, sift flour. Slowly add water in a steady stream while mixing with a wooden spoon. Keep adding water until a ball is formed. With the same procedure, one can use a food processor with a metal blade. Let ball of dough relax for about 30 minutes and cover with damp cloth.
On a floured surface, roll out dough into a thin rectangle. Brush on oil mixture, cover with scallion and season with salt and pepper. Carefully roll dough like a sponge cake. Cut into 4 pieces. Take one piece and twist 3 times. Make a spiral out of this and roll again and flatten to achieve a 5 to 6 inch pancake. In a hot non-stick pan, coat with canola oil and pan sear both sides until golden brown. Cut into wedges and serve immediately with dipping sauce.