INGREDIENTS
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1 c (2 sticks or 226g) unsalted butter, softened
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1 1/4 c (250g) granulated sugar
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3/4 c (94g) confectioners sugar
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3 (6 ounces) eggs, room temperature
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3/4 c (168g) vegetable oil
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1 tsp. cream of tartar
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1 tsp. salt
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5 1/2 c (688g) all-purpose flour
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1/2 c (113g) unsalted butter, softened
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3/4 c (173g) sour cream
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4 c -5 cups (440-550g confectioners sugar)
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1 tsp. salt
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red food color