Side note - my gramma Taylor used to have one of these nut grinders when I was little. One of my favorite things to do was have her give me some walnuts or peanuts to grind in the little yellow nut grinder, even if we weren't baking anything. We got a similar grinder recently and it grinds those nuts better than a food processor could ever hope to.
Cake is done!
On to the chocolate frosting!