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Preheat oven to 275F and butter a pie plate very well (I would use a silicone pie plate now).
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beat together egg whites, vanilla, salt, cream of tartar until soft peaks form.
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Very gradually, beat in sugar until very stiff peaks form.
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Spread mixture in prepared pie plate; build up high sides.
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Bake for one hour; leave oven closed, turn off heat and leave for an additional hour.
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Remove from oven; cool
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Pile in scoops of coffee and vanilla ice cream shaped in balls; freeze.
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Let stand 20 minutes before serving
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Spoon sauce over just before serving
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For the sauce: in small saucepan melt butter; stir in brown sugar, milk and salt.
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Cook, stirring over medium low heat until the mixture boils.
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Remove from heat; add raisins and vanilla and cool slightly.