It’s been cold this winter. Polar vortex cold. So when I stepped into Nostalgia Latin Market on Kerr street, it was a wee escape to the tropics. Two women were talking in Spanish. Shelves full of Mexican canned good, spices, dried chiles, and other interesting looking products. Fresh made tamales cooling in a basket.  I left with some chicken tamales and salsa verde, and knew I would return. On another visit I started talking to the convivial owner. He tells me more about some of the unique Latin and Mexican products he stocks. They offer cooking lessons too. I ask him where he grew up. “Guadalajara, though I spent a lot of…