Using a fork, mix the flour and boiling water in a large bowl. Knead dough into a ball. Cover bowl with plastic wrap; let the dough rest for 30 to 60 minutes. Evenly divide dough into 14 pieces. Roll each piece into a 1/4 inch thick circle. Brush each circle with the olive oil, season with salt and pepper, and sprinkle with about 2 teaspoons of green onions. Roll up, cigar style, and pinch open ends together to form a circle. Roll each circle flat to 1/4 inch. Heat 2 teaspoons of canola oil in a large non-stick frying pan. Fry the cakes until golden brown, about 2 minutes on each side. Makes 14 green onion cakes.