You will need 2 clean, well-greased 1-lb. coffee cans with both ends removed.
Preheat oven to 325°. Mix butter, brown sugar and molasses together in a mixer with a paddle attachment. Add in eggs one at time, beating well between each addition.
Mix dry ingredients in a separate bowl. Alternate adding in the dry ingredients and the sour cream to the egg/sugar mixture. Fold in currants.
Place the coffee cans on a baking sheet lines with parchment paper and fill about three quarters of the way up. Bake 20-25 minutes. Makes 2 loaves.