Violet Bakery's Claire Ptak on her new cookbook, working at Chez Panisse and England's 'cake people'

Showing a third-trimester fullness, her light hair still wet from the shower, Claire Ptak, 41, sat in the top floor seating area of her tiny Violet Bakery in East London on a late December morning as the fragrance of what was cooking in her downstairs open kitchen floated up a narrow staircase,...