"I asked my physio to bring me something - I just wanted to get some carb, some potato or rice," the world No. 66 said after her straight sets win.
"It probably looks weird having a fork and eating like that, but better than low sugar anyway. I preferred to try to get some energy back in the body."
As she dined, the chair umpire was heard to say: "I have seen many strange things, never seen eating courtside before…never saw this kind of food."
While it looked like a Chinese takeaway, Siegemund assured the umpire it was a bowl of noodles.
After a decent graze, she won 10 of the last 12 games to set up a clash against two-time Wimbledon champion Petra Kvitova.