Ashkenazic Sour Cream Coffee Cake (Smeteneh Küchen) Recipe | Epicurious.com
"Coffee cakes rank among the most popular of comfort foods, welcomed at breakfast, lunch, afternoon tea, dinner, and as the name indicates, coffee breaks. A coffee cake batter is generally more liquid than a quick bread one and contains a bit more sugar, and as a result, the final product is lighter and moister. On the other hand, coffee cakes tend to be less sweet than butter cakes. There are many versions of kuchen, this streusel-topped sour cream type being a very popular one. It is commonly served at the meal following Yom Kippur, or Shavuot, and on Sabbath afternoons or the melaveh malcha ("accompanying the queen") party following the Sabbath. For the later occasion, spices are added to the batter and topping, reflecting those used during the havdallah ceremony signaling the end of the Sabbath...."