How to Make It
In a medium bowl, whisk the flour with the club soda, baking powder, salt and sesame oil.
In a 12-inch nonstick skillet, heat the canola oil. Add the green beans and scallion pieces and stir-fry over moderately high heat until crisp-tender, about 5 minutes. Stir in the red chile and pour the batter evenly on top. Cook over moderate heat until browned on the bottom, about 5 minutes. Slide the pancake onto a plate, then invert it into the skillet and cook until browned on the second side, 3 to 5 minutes longer. Transfer to a platter and cut into wedges. Garnish with sliced scallions and serve with soy sauce.