In a large mixing bowl combine flour, baking powder, salt and pepper. Add water and egg, and whisk until just combined. The consistency of batter should be like breakfast batter. Add more water if batter seems too stiff.
Add the green onions and shrimps to the bowl, toss well to coat.
Heat 1 tablespoon oil in a skillet over medium heat, add 1/4 cupful of batter to the skillet and spread out thinly. Sear the pancakes 3-4 minutes until the edges seems to form a crust, flip to the other side.
Add more oil if the skillet seems dry. You should see the golden brown crust. Sear the other side of pancakes for another 3 minutes until golden as well.
You might need to adjust the heat to med-low in order not to burn the pancakes.