|Region or state||Israel and Jewish (Central Europe).|
|Main ingredients||Dough: sour cream or cream cheese
Filling: any of raisins, walnuts, cinnamon, chocolate, marzipan, poppy seed, or fruit preserves
|Cookbook: Rugelach Media: Rugelach|
Rugelach (//; ROO-ge-lahkh; Yiddish: רוגעלך) and Hebrew: רוגלך), other spellings: rugelakh, rugulach, rugalach, ruggalach, rogelach (all plural), rugalah, rugulah, rugala, roogala (singular), is a Jewish pastry of Ashkenazic origin. It is very popular in Israel, commonly found in most cafes and bakeries. It is also a popular treat among American and European Jews.
Traditional rugelach are made in the form of a crescent by rolling a triangle of dough around a filling. Some sources state that the rugelach and the French croissant share a common Viennese ancestor, crescent-shaped pastries commemorating the lifting of the Turkish siege, possibly a reference to the Battle of Vienna in 1683. This appears to be an urban legend however, as both the rugelach and its supposed ancestor, the Kipferl, pre-date the Early Modern era, while the croissant in its modern form did not originate earlier than the 19th century (see viennoiserie). This leads many to believe that the croissant is simply a descendant of one of these two.
The name is Yiddish, the Jewish language of eastern Europe. The ach ending (ך) indicates plural, while the el (ל) can be a diminutive, as, for example, shtetlekh (שטעטלעך, villages) is the plural of shtetl (שטעטל, village), the diminutive of shtot (שטאָט, town). In this case, the root means something like "twist" so the translation would be "little twists," a reference to the shape of this cookie. In this context, note that rog (ראָג) means "corner" in Yiddish,. In Polish, which influenced (and was in turn influenced by) Yiddish, "róg" can mean "corner", but can also means "horn"—both the kind on an animal and the musical kind. Croissant-shaped pastries, which look like horns, are called in Polish "rogale" pl:Rogal świętomarciński. That word is almost identical in pronunciation and meaning to the Yiddish "rugelach".
Alternatively, some assert that the root is rugel, meaning royal, possibly a reference to the taste. This explanation is in conflict with Yiddish usage, where the word keniglich (קעניגליךּ) is the dominant word meaning royal.
Finally, in modern Hebrew, they are known as roglìt (רוֹגְלִית), a postbiblical Hebrew word meaning "trailing vines", though the name rugelach (רוגלך) is still commonly used by Hebrew speakers.  The Yiddish word ruglach probably came first. The modern Hebrew is probably a neologism, chosen for its similarity to the Yiddish and its descriptive meaning.
Rugelach can be made with sour cream or cream cheese doughs, but there are also pareve variants with no dairy ingredients, so that it can be eaten with or after a meat meal and still be kosher. Cream cheese doughs are the most recent, probably American innovations, while yeast leavened and sour cream doughs are much older.
Rugelach closely resemble schnecken, an eastern European (Poland, Russia, Ukraine) Jewish pastry that generally has cream cheese dough and is rolled into a cylinder and sliced, becoming a flat spiral, whereas rugelach are formed from individual triangles of dough and rolled into a crescent shape. In recent years, chefs have introduced savory versions of these pastries, filled with chicken and schmaltz or salmon and boursin cheese. 
- Joan Nathan, Joan Nathan's Jewish Holiday Cookbook, Schocken, 2004; page 284.
- Judith M. Fertig, All American Desserts, Harvard Common Press, 2003; page 135.
- Gil Marks, The World of Jewish Cooking, Simon and Schuster, 1996; page 326.
- Joseph Amendola and Nicole Rees, The Baker's Manual, Wiley, 2003; page 223.
- Alexander Harkavy, A Dictionary of the Yiddish Language, 1898; page 312.
- Lois Young-Tulin, Chapter 5: Mandelbrot, Rugelach and a Family Quilt, in Jewish Mothers Tell their Stories, Hayworth Press, 2000; page 45
- Alexander Harkavy, A Dictionary of the Yiddish Language, 1898; page 308.
- Ernest Klein, A Comprehensive Etymological Dictionary of the Hebrew Language, McMillan, 1987; page 609.
- The Taste of Shabbos, Aish HaTorah, 1987; page 118.
- Judy Bart Kancigor, Cooking Jewish, Workman, 2007; page 474.
- Barbara Grunes, Best-Ever Rugelach, The Best Bake Sale Ever Cookbook, Raincoast Books, Vancouver, 2006; page 68.
- Helene Siegel and Karen Gillingham, Ida's Rugelach, Totally Cookies Cookbook, Celestial Arts Publishing, Berkeley, 1995; page 74.
- Joyce Eisenberg and Ellen Scolnic, "The Whole Spiel: Funny essays about digital nudniks, seder selfies and chicken soup memories," Incompra Press, 2016; p. 126. ISBN 978-0-69272625-9