Yes, you can freeze the un-fried assembled samosas. To freeze, arrange the assembled samosas, untouching, in a single layer on a baking tray lined with baking parchment (to prevent them sticking to the tray). Place the baking tray in the freezer and leave until the samosas are frozen. Remove from the freezer and place the frozen samosas in a plastic freezer bag and return to the freezer. The samosas can be frozen for up to 6 months. To use remove from the freezer and fry from frozen, as per the recipe.