1. Brush an 8 1/2-by-4 1/2-inch loaf pan with 1 Tbsp. melted butter.
2. Flatten out dough on a lightly floured surface, sprinkle with one third of currants and caraway seeds, and knead in. Repeat with remaining currants and caraway seeds until all are kneaded into dough. Shape into a loaf, transfer to loaf pan, cover with a clean kitchen towel and allow to rise in a warm place until doubled in size, about 1 1/2 hours.
3. Position rack in middle of oven and preheat to 375°F. Brush dough with remaining melted butter, sprinkle with salt and bake until golden brown, 30 to 35 minutes. Let cool in pan on a wire rack. Slice and serve.