Portuguese towns and cities alike are incredibly proud of their traditional sweets and pastries. Sintra, a beautiful hill town not far outside of Lisbon, is understandably proud of this recipe. It is believed that this recipe dates from the 14th Century! The actual recipe is, understandably, a close-guarded ages old secret, but this is a close approximation that I found on the internet. I visited Sintra a few years ago and was amazed at how wonderful these tarts tasted! These keep longer than most pastries if stored in an airtight container. (I'm not too sure of the yield - what I have provided is an approximation).