Flour, butter, eggs: three everyday store-cupboard ingredients which, with a little elbow grease, can be transformed into the wonderful and endlessly versatile cream puff pastry. From the quintessential Chocolate Eclair, always a favorite in the p tisserie shop window, to the delicate Green Matcha Cream Puffs--perfect for an elegant afternoon tea--and the impressive Gateaux St. Honore, this light-as-air buttery pastry offers so many options. Start...