⭐ Buttermilk (Best Gluten-Free Option)
1 cup buttermilk per 1 cup whole milk Quick tip: Adds slight tanginess and acidity that complements sourdough fermentation, maintaining moisture and crumb softness.
Buttermilk contains lactic acid and a similar fat content to whole milk, which helps tenderize the gluten network and enhances flavor complexity. The acidity also supports the sourdough's natural fermentation process by promoting a balanced environment for yeast and lactobacilli.
When substituting, reduce any additional acidic ingredients slightly to avoid over-acidification. Monitor dough hydration as buttermilk can be slightly thicker than milk.
The final bread will have a subtle tang and moist crumb very close to the original recipe, with a slightly enhanced sour note that complements sourdough's natural flavor.