Instructions

1. Step
   Preheat oven to 400°F (200°C). Line a baking sheet with parchment paper. Grease an 8 x 8 x 2-inch deep (20 x 20 x 5 cm) baking dish; set aside.
2. Step
   Toss together strawberries, rhubarb and sugar. Spread onto prepared baking sheet. Roast for 30 minutes or until golden. Remove from oven and reduce oven temperature to 350°F (180°C).
3. Step
   Meanwhile, in a medium bowl, whisk together flour, sugar, baking powder, baking soda and salt. In a small bowl, whisk together buttermilk, egg and vanilla. Pour into flour mixture and add butter. Stir to combine. Spread into prepared baking dish. Sprinkle roasted fruit mixture over top evenly. Bake for about 50 minutes or until cake is golden and cake tester comes out clean. Let cool slightly.
4. Step
   Cut cake and serve with whipped cream or vanilla ice cream.