Conveniently for all Magnus Chases, all the ingredients are prepped and fresh and just need to be assembled. Carefully referring to the instruction sheet, he measures milk and tea into a cup, then adds enough brown sugar syrup to hit 50% sugar, a scoop of ice, and all the bubbles. Then he takes the whole affair over to the lid-sealing machine thing and lets it do his thing. Finally, he gives the sealed cup a good shake, and retrieves a straw. "Ta-da?"