Ephraim, he mixes himself among the nations. Ephraim is a pancake not turned over.
Ephraim had become like all the other nations rather than distinctive, as Yahweh intended (Exodus 19:6). To use another figure, Ephraim was similar to a pancake that the cook had not turned over, all burnt and black on one side and soggy and runny on the other. In other words, she was only half-baked, worthless, not what God intended or what could nourish others. She was crusty toward Yahweh but soft toward other nations.