I'd assume that it's like one of those tasty Reese's Peanut Butter Cups. The crust is the chocolate, while the peanut butter is the mantle. Unless you get gyped and you end up without any peanut butter, but just a hollow hole in your candy...bastards...
Of course, if whatever force is accelerating the earth is balanced on all the sides on the cylinder upon which the earth rests, other than the top, then the mantle could be exposed on the bottom...but I'd imagine it would cool to form crust, unless the pressure caused by the force pushing on it caused enough heat to keep it from cooling, of course.