- Preheat oven to 325 degrees. Grease an 9×11” baking pan.
For filling:
Slice rhubarb and strawberries 1/2 inch thick and toss with sugar, cornstarch and ginger. Set aside.
- To make crumb topping, in a large bowl, whisk together sugars, spices, salt and butter until smooth. Stir in flour with a spatula. It will look and feel like a solid dough. Set aside.
- To prepare cake, in a small bowl, stir together the sour cream, eggs, and vanilla.
- Using a mixer fitted with paddle attachment, mix together flour, sugar, baking soda, baking powder and salt.
- Add butter and a spoonful of sour cream mixture and mix on medium speed until flour is moistened. Increase speed and beat for 30 seconds. Add remaining sour cream mixture in two batches, beating for 20 seconds after each addition, and scraping down the sides of bowl with a spatula. Scoop out about 1/2 of batter and set aside.
- Scrape remaining batter into prepared pan. Spoon strawberry and rhubarb mixture over batter. Dollop set-aside batter over rhubarb; it does not have to be even.
- Using your fingers, break topping mixture into big crumbs, about 1/2 inch in size. They do not have to be uniform, but make sure most are around that size. Sprinkle over cake. Bake cake until a toothpick inserted into center comes out clean of batter (it might be moist from rhubarb), 45 to 55 minutes. Cool completely before serving.