The Art of French Pastry

flour because it does not
contain any gluten (for
recipes such as sponge
cake, potato starch would
be a good substitute should
you run out of cornstarch).
Cornstarch is an excellent
thickener in pastry creams,
contributing a smooth
texture because of its lack
of gluten. It keeps very well
at room temperature in an
airtight container or in its