Excerpted from Flavor Flours by Alice Medrich (Artisan Books). Copyright © 2014. Photographs by Leigh Beisch. Chestnut Jam Tart Makes 10 servings Alice says, "A jam tart seems like a relaxed, simpler-to-make linzer torte, with an Italian accent instead of a German one. A jam tart is called fregolata in Italian, and it’s pretty and