It’s her third day as proprietor of Hot Daisy Pizza, and Tammie Coe — the classically trained pastry chef famous for ooey-gooey cupcakes, big cookies and whimsical fondant-covered cakes — seems to be having fun in her new role as pie slinger. At 3:30 in the afternoon, her tiny Roosevelt Row shop (formerly known as Tammie Coe Cakes) enjoys a steady stream of curious neighborhood customers, eager to try a slice of pepperoni or margherita...