The recipe uses floor-malted Bohemian Pilsner malt, made from Bohemian spring barley. This malt shows a wider color range among individual grains than malt processed by modern pneumatic malting methods, with their tighter temperature control. The result is a fuller malty flavor, with a bit of residual sweetness. It is slightly under-modified however, and will benefit from an acid rest and protein rest.
The mash bill uses 3% acidulated malt to lower mash pH, in the German manner, which prohibits additives such as organic acids to do so. In soft water this is enough to bring the pH down to about 5.2 in a full-grain recipe.
Munich malt contributes a mild toasty bread flavor to the brew. Carapils is a high dextrin malt that provides foam stability and full body to the beer while adding very little flavor.
Because the starting gravity is a bit above the high-end of the range typical for North German Pilsner (which is around 13 Plato), the hopping rate is also a bit higher than the typical example (which is 35-45 IBU).