What surprises Hannah in the milk?

Hannah is surprised by the lumps of cream floating in the milk.

Anyway, she was starving, even if it was a dream. She reached for the milk pitcher and poured herself a glass of milk, took a swallow, and choked. It tasted awful. She looked into her glass. "It's got things floating in it," she said.
"What things?" Gitl looked.
"There."
"That is not things. That is the cream. You have no cream in the milk in Lublin?"