Yield: This recipe makes 24 square slices from a standard 13-by-9-inch baking dish. Cut into a 4-by-6 grid for even portions.
Technique: Preheat your oven for a full 15 minutes before baking. Rieska relies on immediate high heat to brown the top and set the center, so an under-preheated oven will leave the bread pale and underdone.
Measuring: Spoon rye flour into the measuring cup and level it off rather than scooping directly from the bag. Scooping packs the flour and can make the dough dry and dense.
Storage: Rieska keeps at room temperature for up to 2 days wrapped tightly or stored in an airtight container. Wrap individual slices and freeze for up to 2 months. Reheat in a low oven for a few minutes or warm in the microwave.