Eli Zabar struggled for years to get this coffee cake -- a staple of his childhood that had disappeared from New York's ethnic bakeries -- just right. It has a rich sour cream dough, the perfect amount of gooey filling, and lots of raisins and nuts. Packed in its own pan for easy warm-ups, this 4-pound cake is big enough to easily serve 12 to 14 people for brunch any day of the week.