Preheat oven to 350 degrees and lightly butter a cast iron skillet on the bottom. Alternately you can line a cookie sheet with parchment paper or use a silicone baking mat.
Whisk the flour, baking powder, baking soda, salt and sugar together into a large bowl.
Using two forks or a pastry blender cut the cold butter into the dry ingredients until the butter is pea sized.
Make a well in the center of the dry mixture and pour the buttermilk in the well.
Mix the ingredients together with a wooden spoon to make a soft dough but don't overmix. The dough will be a little sticky and look "shaggy" in texture. Gently fold the raisens into the dough.
Turn dough out onto a lightly floured surface and knead gently no more than 8 times. While you are kneading the dough try reciting one verse of "Mother Machree" for fun. The verse goes "I kiss the dear fingers so toil worn for me. Oh God bless you Mother Machree."
Shape dough into a ball, and place in a lightly buttered cast iron skillet, then with a sharp knife "slash the bloomin' thing" twice so you make an X in the top of the loaf. You can use a bench scraper to form the X in the top of the dough instead of a knife. Slashing the top of the loaf helps to vent it allowing an even rise and can also makes the bread more decorative.
Bake at 350 degrees for 30 minutes. Let the loaf cool for at least 30 minutes before eating.
NOTES: *Bread will stay fresh and delicious for about 2-3 days. *You can freeze the loaf or individual slices of bread in a freezer safe container for up to 3 months. *Optional add-in ideas: Grated cheese, green onion, bacon, rosemary or dill, or dried fruit. Whole oats can be sprinkled on top of the loaf before baking. Try brushing with butter and sprinkling sugar on top before baking for a sweet treat!