Put the sultanas in a small bowl and pour hot water over them. Drain in a colander and dry with paper towel. Add to the flour mixture along with the caraway.
Add the buttermilk to the dough and work the dough for 4-5 minutes until all ingredients are well mixed.
Line a baking tray with baking paper. With floured hands form two loaves and lay apart from each other on the baking tray (they can be an irregular shape). Dust with a little flour and use a sharp knife to cut a cross on each loaf.
Bake for 45-55 minutes in the preheated oven until a skewer comes out clean. Cool on wire rack.