What pastry from Portugal traditionally features creamy egg-custard inside flaky pastry crusts?

Pastel de Nata

Who starred as Batman in Christopher Nolan's "The Dark Knight" trilogy? Which iconic musician is known as "The Godfather of Punk"? Which country built Machiavelli’s historically influential political theory “The Prince”? Who was the ancient Egyptian god of the afterlife and rebirth? What's the next prime number after 47?