Rusk flour

A rusk is a biscuit such as Zwiebach made from sliced yeast bread, then baked until it is brown and dry. Rusk flour is pulverized rusk. Rusk flour is also a term used to described browned bread crumbs and it is savory rather than sweet.

Where To Buy Rusk Flour

The flour does not have a long shelf life so it is best to purchase your own.  You can buy rusk biscuits in most grocery stores.  Simply place the rusk in a food processor and grind to the desired consistency.  See other substitutions below.

For sweet dishes, substitute graham cracker crumbs and for savory substitute, toasted French bread crumbs. To make your own, lightly toast slices of French bread, break in pieces and whirl in food processor to a coarse texture.