1. Take a super large pullman loaf (pan de miga gigante); white or whole wheat. Height and width average around a sq. foot (30cm x 30cm) and length of about 18in. to 22in. (45cm to 50 cm) in size.
2. Trim off crust so that non of the browned part remains.
3. Cut into thin slices. 1/3 inch (1 cm) thick.