01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper or lightly grease it.
02 - In a large bowl, whisk together the whole wheat flour, all-purpose flour, baking soda, salt, and sugar until well blended.
03 - Stir in the currants until evenly distributed throughout the flour mixture.
04 - Create a well in the center of the dry ingredients. Pour in the buttermilk and melted butter. Mix gently with a wooden spoon or hands until a soft, sticky dough forms. Avoid overmixing to prevent tough bread.
05 - Turn the dough onto a lightly floured surface. Shape into a round loaf approximately 7 inches in diameter.
06 - Place the loaf on the prepared baking sheet. Using a sharp knife, cut a deep X across the top about 1/2 inch deep to promote even baking.
07 - Bake for 35 to 40 minutes until the loaf is golden brown and produces a hollow sound when tapped on the bottom.
08 - Transfer the bread to a wire rack and let cool for at least 30 minutes before slicing to ensure proper texture.