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Cut the rhubarb into 1/2-inch pieces.
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Toss with 2 tablespoons of sugar. Set aside.
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Preheat oven to 450 F.
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Line a baking sheet with parchment paper
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Place flour, sugar, baking powder, and salt in a food processor and pulse until combined.
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Add the butter pieces and pulse again until the butter and flour mixture has become crumb consistency.
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Add milk and vanilla and pulse until the dough is wet.
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Fold in the walnuts, then the rhubarb.
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Pat out into a circle on a floured surface.
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Cut into 8 triangles.
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Place on the baking sheet and brush with 1/3 cup cream.
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Bake for 25 minutes or until scones turn golden brown.
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Transfer to a wire rack. Let cool completely.
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Whisk together 1/3 cup cream with the powdered sugar.
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Drizzle the glaze over the scones.
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When the glaze has hardened, plate and serve.