Pick large and even shaped purple yam for best results. Wash, and peel them. Slice and cube the purple yam and steam for 20-25 minutes until cooked. If using frozen purple yam, usually they are already shredded. Defrost and put in microwave proof bowl. Cover and microwave for 6 to 8 minutes. Pour out any liquid from the bowl and let cool.
Put the cooked purple yam in large bowl. With a fork or potato masher, mash the purple yam until quite smooth. Add the glutinous rice flour and tapioca starch, sugar, milk and condensed milk. Mix well. Cover with plastic wrap and let rest for 30-45 minutes.
Dust some tapioca starch in your hands, use roughly 1 tablespoon of the mixture in your hand and form them into the desired shape, typically a cocoon shape.
Heat oil in a saucepan till very hot. Deep fry the Purple Yam pieces till golden on the outside. Be careful not to overcrowd the pan so the fritters are cooked evenly.