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In a bowl, combine the flour and salt.
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Add oil and milk, tossing with a fork until mixture forms a ball.
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Shape dough into a disk; wrap in plastic wrap.
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Refrigerate for at least 1 hour.
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In another bowl, combine the rhubarb, raspberries, sugar and tapioca; let stand for 15 minutes.
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Unwrap dough and place on a parchment lined baking sheet.
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Cover with waxed paper and roll the dough into an 11 inch circle.
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Discard waxed paper.
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Spoon fruit mixture into the center of dough to within 2 inches of the edges.
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Fold edges of dough over fruit, leaving center uncovered.
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Bake at 400 degrees for 25-30 minutes or until crust is golden brown and filling is bubbly.
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Remove to a wire rack.
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Combine the glaze ingredients until smooth.
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Drizzle over warm tart.