Buttermilk Bar

The buttermilk bar is a regional treasure that has earned a devoted following, particularly in California and the western United States. This rectangular cake donut is distinguished by its use of buttermilk in the batter, which imparts a subtle tanginess that balances the sweetness of the donut and creates an extraordinarily tender, almost melt-in-your-mouth crumb. The bar shape gives it a generous surface-to-interior ratio, meaning more of that delicious golden crust in every bite.

Buttermilk has been used in American baking for centuries, prized for its ability to tenderize doughs and batters through its natural acidity. When buttermilk reacts with baking soda in the batter, it creates a fine, even crumb structure that is noticeably more delicate than a standard cake donut. The result is a donut that practically melts on the tongue, with a texture that is somehow both substantial and ethereal at the same time.

The buttermilk bar's exterior is typically slightly crunchy and golden, with a thin crust that gives way immediately to the tender interior. Most buttermilk bars are coated in a simple sugar glaze that complements the tangy dough without overwhelming it. The glaze settles into the surface of the bar, creating a sweet, slightly crackly shell that contrasts beautifully with the soft crumb beneath. Some shops offer buttermilk bars with chocolate or maple frosting, though purists prefer the classic glazed version.

In California, the buttermilk bar is so popular that many shops sell out before mid-morning. It has become a defining item at legendary donut shops throughout the state, from Los Angeles to San Francisco. The buttermilk bar's rise in prominence mirrors the broader artisan donut movement's emphasis on quality ingredients and traditional techniques. For many donut connoisseurs, the buttermilk bar represents the platonic ideal of a cake donut — simple, perfectly executed, and deeply satisfying.