Coarse dry whole-wheat breadcrumbs: We like Ian’s brand of coarse dry whole-wheat breadcrumbs, labeled “Panko breadcrumbs.” Find them in the natural-foods section of large supermarkets. Or, make your own breadcrumbs: Trim crusts from firm sandwich bread. Tear the bread into pieces and process in a food processor until coarse crumbs form. One slice makes about 1/3 cup. Spread the breadcrumbs on a baking sheet and bake at 250°F until dry and crispy, about 15 minutes.