INGREDIENTS
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Caramel Topping:
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1 tablespoon unsalted butter, plus more for the pan
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1/2 cup sugar
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1 1/2 cups rhubarb, peeled, halved lengthwise and cut into 1/2-inch pieces (about 5 ounces)
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1 1/2 cups strawberries, hulled and thinly sliced (about 5 ounces)
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1 tablespoon cornstarch
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2 tablespoons strawberry jam
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Kosher salt
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Cake:
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1 3/4 cups all-purpose flour (see Cook's Note)
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1 teaspoon baking powder
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1/2 teaspoon baking soda
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1/2 teaspoon fine salt
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3/4 cup milk
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1/4 cup sour cream
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1 stick (8 tablespoons) unsalted butter, at room temperature
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1 cup sugar
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2 large eggs
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1 teaspoon pure vanilla extract