"Pasticceria Cucchi is protective of its panettone. The Milanese pastry shop has been baking the famous fruitcake—a traditional Italian Christmas treat—in a humble kitchen for over 70 years. Laura Cucchi and her sister, Vittoria, whose grandparents founded the pasticceria in 1936, are thinking about expanding. But they fear that any change to the kitchen’s microclimate or production volume could upset il lievito madre, the revered mother yeast they use to make panettone." - Serena Renner