The buttermilk producers a bread with a soft crumb and a tangy flavor.Ingredients • 3 cups bread flour, plus more for work surface and sprinkling • 2 1/2 tsp. kosher salt • 1/4 tsp. active dry yeast (from 1 [1/4-oz.] envelope) • 1 cup water • 1/2 cup whole buttermilk • Fine yellow cornmeal, for…