Cho caught the facial expression and almost laughed. It was more because she understood. Especially if it was in relation to the goose flavoring. Fred was a curious creature. She didn't plan on adding the goose flavoured drink to the menu, however. It was a one time thing...unless Fred really liked it that much. Then it would be a Fred-only drink.
"Well, technically, the biggest we have is this one." She held up a cup that would be about the size of a venti cup at starbucks. "But if you wanted, we could transfigure a cup into a more thermos like something. It's not like anyone will really mind." She set to making the cup of tea, however, while she waited to hear whether Romilda wanted the thermos or not.