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Sift together; flour,baking powder,salt & seasonings, set aside.
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Beat oil and sugars together until smooth, beat in egg yolks & boiling water gradually; beat for 2-3minutes.
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Add dry ingredients to sugar mixture gradually, stirring well.
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Stir in bourbon (take a sip if you like, as this adds to the character of the cake).
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Stir in pecans.
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Peel and grate sweet potatoes (should end up with 2 cups packed); stir into sugar mixture.
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Beat egg whites until they form soft peaks; add the cream of tartar & salt.
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Stir 1/4 of the whites into sweet potato mix, then fold in remainder.
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Place in a greased 10 inch tube pan and bake about 1 hour in a preheated 350 degree oven.
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Cool pan for at least 15 minutes before unmolding.
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Serve solo, or dust with confectioners' sugar.