Roast the green pea flour and sift into a mixing bowl. Sift in flour, rice flour and icing sugar. Add in finely-chopped almond nibs to mix. Add shortening and mix until mixture turns crumbly.
Knead and lightly press until the dough clings together. Press a small portion into a wooden mould. Knock the mould against a tabletop to dislodge the biscuit. Arrange the biscuits on lightly-greased trays and bake in an oven preheated at 140°C-150°C for 25-30 minutes or until lightly browned on the bottom. Leave the biscuits on the tray for 5-6 minutes before placing them onto wire racks to cool.