Sift together flour, baking powder, baking soda and salt; cut in the butter with a pastry blender or two knives, until the mixture resembles coarse meal.
Stir in the raisins and caraway seeds.
Add buttermilk and blend to moisten the dry ingredients.
Turn dough into a floured board and knead for several minutes, until smooth.
Form dough into a round ball and place in a greased baking sheet.
Flatter the dough until it’s about 1 1/2 inches high.
Brush too and sides with egg wash; cut a deep cross on the top of the bread with a sharp knife.