Panko is a crunchy, flaky bread crumb from Japan, available in Asian markets and most grocery stores. If you can’t find panko, make your own bread crumbs using day-old French or Italian bread. Place bread in a food processor fitted with a steel blade and pulse three or four times or until bread turns to fine crumbs. Spread on a baking sheet. Bake at 300° 6 to 8 minutes, or until crumbs are dry and crisp. Do not brown.