mixed ... among the people - by leagues with idolaters, and the adoption of their idolatrous practices (Hos 7:9, Hos 7:11; Psa 106:35).
Ephraim ... cake not turned - a cake burnt on one side and unbaked on the other, and so uneatable; an image of the worthlessness of Ephraim. The Easterners bake their bread on the ground, covering it with embers (1Ki 19:6), and turning it every ten minutes, to bake it thoroughly without burning it.