A strudel (, ) is a type of layered pastry with a filling that is usually sweet, but savoury fillings are also common. It became popular in the 18th century throughout the Habsburg Empire. Strudel is part of Austrian cuisine but is also common in other Central European cuisines. In Italy it is recognized as a traditional agri-food product (PAT) of South Tyrol. The oldest strudel recipes (a Millirahmstrudel and a turnip strudel) are from 1696, in a handwritten cookbook at the Wienbibliothek im Rathaus (formerly Wiener Stadtbibliothek). The pastry descends from similar Near Eastern pastries (see baklava and Turkish cuisine). Etymology Strudel is an English loanword from German. The word derives from the German word Strudel, which in Middle High German literally means "whirlpool" or "eddy". Pastry The best-known strudels are apple strudel (Apfelstrudel in German) and Topfenstrudel (with sweet soft quark cheese, in Austrian German Topfen), followed by the Millirahmstrudel (milk-cream strudel, Milchrahmstrudel). Other strudel types include sour cherry (Weichselstrudel), sweet cherry, nut filled (Nussstrudel), apricot strudel, plum strudel, poppy seed strudel (Mohnstrudel), rhubarb strudel and raisin strudel. There are also savoury strudels incorporating spinach, cabbage, potato, pumpkin, and sauerkraut, and versions containing meat fillings like the Lungenstrudel or Fleischstrudel. Traditional strudel pastry differs from puff pastry in that it is very elastic. It is made from flour with a high gluten content, water, oil and salt, with no sugar added. The dough is worked vigorously, rested, and then rolled out and stretched by hand very thinly with the help of a clean linen tea towel or kitchen paper. There are numerous techniques for manually pulling strudel dough. One method is to roll the dough thin before laying it over the back of the hands and drawing it thin by pulling the hands apart from one another. Purists say that it should be so thin that you can read a newspaper through it. A legend has it that the Austrian Emperor's perfectionist cook decreed that it should be possible to read a love letter through it. The thin dough is laid out on a tea towel, and the filling is spread on it. The dough with the filling on top is rolled up carefully with the help of the tea towel and baked in the oven. Apples Regional apple varieties prevail with choice based on firm to semi-firm texture once baked. Tasting notes are acidic with apple flavor.