Apple Strudel with Caramelized Walnuts

Strudel seems like a complex dessert, but once you have a feeling for the dough and its elasticity, all else is elementary. I recall my grandma saying that for the strudel to be good you need to be able to read the newspaper through the stretched dough, so rolling and stretching it as thin as you can is the key to a special strudel. Keep one idea in mind: do not be afraid to handle the dough, lift it up on the back of your hands, curl your fingers into a fist, and stretch the dough with your knuckles. It will yield and stretch without tearing. Or grasp one edge and lift the sheet above the work surface and let it hang free—just the force of gravity will make it stretch. Or, if you have someone to help you, pull the dough from opposite sides—it will stretch that way too. Don’t worry if the edges remain a bit thicker: you can cut those off with a pizza cutter before filling the strudel. This is a large strudel; it can be served for a couple of days. Baked strudel freezes well, so leftover pieces can be wrapped securely and frozen for a couple of months. Defrost when needed, and reheat before serving.