INGREDIENTS
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The filling:
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1/3 cup lightly packed brown sugar
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1 tablespoon plus 1 teaspoon cornstarch
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pinch salt
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1 pound trimmed rhubarb, sliced 1/4" thick (about 4 cups)
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3/4 pound strawberries, hulled, quartered if large, halved if small (about 3 cups)
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The crunchy topping:
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1/2 cup plus 2 tablespoons organic granulated cane sugar
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3/4 cup oat flour
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1/4 cup white rice flour
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1 teaspoon baking powder
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1/2 teaspoon cinnamon
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1/4 teaspoon fine sea salt
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1/2 cup old-fashioned rolled oats
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1 egg, beaten well
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8 tablespoons unsalted butter, melted
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1 tablespoons coarse sugar (such as "sugar in the raw") for sprinkling