Slice the crusts off of 200 grams Japanese sandwich bread and cut the bread into 1-inch (2.5 centimeter) cubes.
200 grams Japanese sandwich bread
Put the bread cubes in a food processor and pulse for 1-2 seconds at a time until the panko reaches your desired size. For course panko this will require 10-12 pulses.
Use the panko fresh within a few days, or you can spread the bread crumbs out onto a parchment lined baking sheet and bake it in a 285°F (140°C) oven until it is dried out and crisp. Dehydrated panko can be stored in an airtight container in the refrigerator for up to one month.