Shikomi Haigo (仕込配合): The Brewing Recipe That Defines Sake

Two breweries can start with the same rice variety, the same well, and the same yeast. Yet the sake in the glass tastes nothing alike. The reason usually hides in a document that drinkers never see. Brewers call it the shikomi haigo. So what is Shikomi Haigo? Shikomi Haigo (仕込配合) is the complete brewing recipe for a batch of sake. It fixes the weight of steamed rice, the weight of koji rice, the volume of brewing water, and the size of the yeast starter. It also decides how those amounts split across each stage of the mash. The word itself is fairly plain. Shikomi means preparation, or charging a tank. Haigo means blending, or proportioning. Together they describe one act: deciding how much of each thing goes in, and when. Most brewing guides stop at the process. They describe washing, steaming, koji making, and fermentation in order. That story is true, though it leaves out the numbers. And the numbers are where style actually lives. Those numbers also stay private, since every brewery guards its own. This guide walks through the whole idea. First we define the three ratios that matter most. Then we open a sample recipe sheet, follow each figure through the tank, and compare hypot...