Preheat oven to 375 degrees F (190 degrees C) and place the rack in the center of the oven. Line a baking sheet with parchment paper.

In a large bowl, whisk together the flour, sugar, baking soda, and salt. Cut the cold butter into small pieces and blend into the flour mixture, with a pastry blender or two knives, until the mixture looks like coarse crumbs. Stir in the raisins. Make a well in the center of the flour mixture and add most of the buttermilk. Using yours hands, or a wooden spoon, mix (adding more buttermilk if necessary) until you have a soft moist dough.

Transfer to a lightly floured surface and gently knead the dough into a 7 inch (18 cm) round. Place the round on your prepared baking sheet and then, with a sharp knife, cut a 1/4 inch deep "X" across the top of the bread.

Bake for about 40 - 50 minutes or until nicely browned and a toothpick inserted into the center of the bread comes out clean. You can also test that is fully baked by tapping the bottom of the bread - it should sound hollow. Remove from oven. This bread is wonderful when served warm with butter. It also makes great toast.

Makes one seven inch (18 cm) round raisin soda bread.