First, you'll need to plump the raisins. Do so by placing raisins in a bowl of warm water, then letting them sit for awhile. I left mine for 2 hours before proceeding to the next step.

Mix flours, sugar, baking soda, and salt in a large bowl.

Cut the butter into the flour mixture, cutting until the butter pieces are very small and mixed in with the flour.

Add in the raisins.

In a small bowl, mix the white vinegar and milk, and let it sit until it curdles.

Add half of the vinegar mixture to the flour mixture, then use an electric mixer to blend it quickly.

Add the rest of the vinegar mixture and quickly blend again with the mixer just until combined.

Place dough on a floured surface. With flour dusted hands, lightly knead the bread about 10x.

Shape the dough into a loaf. Place onto a greased baking sheet.

Bake at 375 for 30 minutes. Check on bread, and if the center is too doughy, bake for 5-10 minutes longer.

Let the bread cool on a wire rack, then cut into 16 slices.