Always pour the tea in first (TIF)! I refuse to listen to anyone who says otherwise. In my opinion, adding the milk first (MIF) is a bit like buttering your plate then pressing your bread into it when you want a piece of buttered bread. By preparing it TIF, you're able to properly melt the sugar before adding the milk and it won't interfere with the brewing process. You also have more control over how much milk is added to reach your desired flavor.