I sometimes believe my love of beans came from the can of refried beans my family would use for tostada nights in the late 1960s and 1970s. I loved the power of creating my own tostada, which at that point would not have had a hint of a fresh vegetable but oddly loaded with hot sauce. It was all good but it was the refried beans that made me a lifelong fan of beans.  I don't think there is a lot of debate about the best way to refry beans. White onion is wilted in freshly rendered lard and then...