Ephraim, he mixes himself among the nations. Ephraim is a pancake not turned over.
But this similitude might also be referred to their punishment; for God had shown before in many places, that the Israelites were so perverse, that they could not be subdued nor brought to a sound mind by any distresses: and he again repeats this complaint. The meaning of the words may then be this, That Ephraim was like a cake, which was not turned on the hearth, because he had been sharply and severely chastised, but without any benefit; being like reprobates, who, though the Lord may bruise them, yet continue obstinate in their hardness. They are then on one side burnt, because they are nearly wasted away under their evils; but on the other side they are wholly unbaked, because the Lord had not softened their perverseness. But what I have adduced in the first place is more suitable to the context. 