Beezer wrote:I don't think he's saying that the milk separates out. It's just that if you pour both drinks from the same pitcher, more foam tends to end up in the first drink than in the second one. I've had this happen to me too. Transferring some milk to the second pitcher before pouring the first drink allows you to make sure your ratios of milk and foam are right for both drinks.
The issue is only relevant to situations like the WBC where you have to serve all the drinks at the same time. In that case, you're going to have steamed milk sitting for a long time if you steam it all at once. Competitors have learned the trick of splitting the milk early, then swirling to recombine and pour later. This results in 4 consistent drinks.
Really not relevant to home baristas -- and not even relevant to pro baristas (outside of competition formats) as a general rule.