How do you make Taro Milk/Bubble Tea with real Taro and not the powder stuff?

I just got some taro roots, and I want to make some purple taro milk, but, I don't even have any idea why it would come out purple.How do you make Taro Milk/Bubble Tea with real Taro and not the powder stuff?
Peel them, and boil them in a pot of water with some sugar until soft, blend them in a blender to make you base, then add your flavours, milk powder or soya mlik and pearl tapicoa to a glass, shake the base and flavours togehter with the protein powder and then decant into the glass, make sure you have some of the oversized straws to drink it, smaller ones will clog up for sure with the tapioca, I would also run the pureed taro base threw a strainer to eliminate any large chucks and blockages, I know they have this in both Vietnam and Thailand, have only had it once, it is alot heavier than the straight bubble teas with only the tapioca and other bases, just make sure to dilute it so it is not to thick.