It took a while, but I have now softened up to the concept of "house butter."Let me get this part out of the way: According to the Food and Drug Administration, it's safe to leave butter and margarine out at room temperature. The agency warns that leaving your butter in this temperate state for a few days may result in its flavor turning toward rancid, but I like to live my life on a knife's edge, and I take the risk. This isn't how I was raised. Did you grow up in a butter household? I didn't. It was...