01 - Preheat oven to 400°F. Line baking sheet with parchment paper or lightly grease surface.
02 - Whisk together flour, sugar, baking soda, and salt in large bowl until thoroughly blended.
03 - Whisk buttermilk, egg, and melted butter in separate bowl until smooth and uniform.
04 - Pour wet ingredients into dry mixture. Add raisins and orange zest. Stir with wooden spoon until shaggy dough forms.
05 - Turn dough onto lightly floured surface. Knead gently just until dough comes together, avoiding overworking. Shape into 7-inch round loaf.
06 - Place loaf on prepared baking sheet. Cut deep X across top with sharp knife, about 1/2 inch deep. Bake 35-40 minutes until golden brown and skewer inserted in center comes out clean.
07 - Transfer to wire rack and cool for minimum 30 minutes before slicing to ensure proper texture.