Ingredients

2 1/2 cups whole-wheat flour 

1 1/2 cups rye flour, such as Bob's Red Mill 

1 1/4 teaspoons baking soda 

1 1/2 teaspoons kosher salt 

2 cups buttermilk 

Preparation

Preheat oven to 425 degrees. In a bowl, whisk together both flours, baking soda, and salt. Pour in buttermilk and stir until just combined, then knead in bowl two or three times, until all of flour has been incorporated and a shaggy dough forms.

Form dough into a 6-inch disk. Transfer to a parchment-lined baking sheet. With a sharp knife or bench scraper, cut into 6 wedges, leaving them in place.

Bake, rotating sheet halfway through, until bread is firm and sounds hollow when tapped on bottom, about 35 minutes. Transfer to a wire rack set over a baking sheet; let cool slightly. Serve warm or room temperature. (Bread is best the day it’s made.)