3 cups all-purpose unbleached flour (we like King Arthur flour)
2 cups whole wheat flour
1 Tbsp baking powder
2 tsp baking soda
4 tsp light brown sugar, mixed with 1 Tbsp water
2-1/4 cups buttermilk
Adjust oven rack to center position and preheat to 325°F. Place flours, baking powder, baking soda and sugar in a large bowl and mix well. Add the buttermilk and stir until a soft dough is formed. Knead the dough in the bowl, then empty onto a countertop and knead a bit longer. If the dough seems wet, use extra whole-wheat flour. Knead until dough comes together.
Divide the dough into two portions and shape each into a round loaf. Press down just to flatten a bit. Place the loaves on an ungreased baking sheet. Sprinkle some additional flour on top of each loaf. Using a sharp knife, make an "x" on the top of each. Allow to rest for 10 minutes, covered with a cloth, then bake for 40 minutes or until the loaves are golden brown and done to taste. Allow to cool, then serve with butter and jam.