Make sure to rinse the sauerkraut thoroughly under cold water to remove excess brine, then drain very well. Excess moisture can affect the texture of the cake.
The beer adds moisture and helps activate the baking soda. A light lager or a dark stout both work well; the flavor is subtle.
Store leftovers covered at room temperature for up to 2 days or in the refrigerator for up to 5 days.
This cake is best served at room temperature to allow the flavors to meld.