Cut in the margarine, add in the sugar and the chopped walnuts. Using a rubber spatula to blend the mixture. Then mix thoroughly till the dough does not stick onto the hands.
Pinch off some dough and lightly form into a ball, make a small dent in the center. Place the biscuits onto a baking sheet, leaving some room between each biscuit.
Brush them with beaten egg. Bake in preheated oven at 180 deg C for about 30 - 35 minutes till golden brown.
Cool Completely before storing in cookie jar.
Recipe by Anncoo Journal at https://www.anncoojournal.com/huptoh-soh-aka-chinese-walnut-biscuits/