These crisp potato pancakes come from the Brombergs' grandmother, Martha Finkelstein, who insisted that there is no flavor substitute for schmaltz (rendered chicken fat). Schmaltz is available at kosher delicatessens. MAKE AHEAD: The latkes can be fried early in the day and re-crisped on a baking sheet in a 350° oven. NOTES To make schmaltz, use the large clumps of fat from the neck, body cavity, and from under the skin. In a small, heavy saucepan, cook the fat over low heat until completely melted. Cool, then strain the clear fat into a glass jar and refrigerate for up to 1 week or freeze. Vanilla Applesauce makes 2 1/2 cups and can be refrigerated for up to 1 week.