The mille-feuille were amazing although for Samuel it was something that was almost too sweet for the size. He was also partly surprised that Lena had gotten one for him. Not exactly that he thought she was that greedy, just more so that he knew how much she enjoyed sweets. Perhaps her one and only weakness.
He also noticed that it was one of the few times that she seemed genuinely happy with something. While she ate the majority of it rather quickly, the first few bites she always took her time with as though trying to savor and discern between all the different flavors that were present before she truly began to enjoy it. It had him wonder what happiness she associated with sweets that made her enjoy them so much.