INSTRUCTIONS

1. Preheat oven to 350°F. Generously butter an 11 x 8-inch (2.3 L) oval baking dish. Sprinkle lightly with granulated sugar, tapping out excess. Set aside.
2. Whisk eggs with sugar, vanilla seeds, and salt in a large bowl until smooth. Add flour, whisking just until no streaks remain. Whisk in milk and cream until a smooth batter forms (mixture will be thin). Pour batter into prepared baking dish. Scatter blackberries evenly over top.
3. Bake in the center of oven until clafoutis is golden, set and a paring knife inserted into the centre comes out mostly clean, about 1 hour to 1 hour 5 minutes. Transfer to a rack and cool, 10 minutes. Serve warm or at room temperature, dusted with icing sugar, with whipped cream.