Preheat the oven to 375?F.
In a large bowl, stir together the flour, oats, sugar, cinnamon, baking soda and salt. Add the butter and blend with a fork or your fingers until crumbly. Add the raisins and toss to combine.
In a mixing bowl or measuring cup, stir together the buttermilk and egg with a fork, and add all at once to the dry ingredients, along with the grated apple. Stir just until combined, then scrape onto a buttered or parchment-lined baking sheet and with dampened hands, shape into a rough domed circle.
Cut an X into the top and bake for an hour, or until golden and the bottom sounds hollow when tapped. Cool slightly before cutting into wedges. Serves 12-16.