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Preheat oven to 425 degrees.
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In bowl, sift together flour, baking powder, sugar, salt and baking soda.
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Stir in orange rind.
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Cut in butter until mixture resembles bread crumbs.
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Stir in enough buttermilk (roughly 3/4 cup) until dough clings together.
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Place dough on a floured board and knead 4 or 5 times.
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Roll or pat into 8" round.
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Place on cookie sheet.
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Brush with the 1 Tbsp buttermilk and sprinkle with 1 tsp sugar.
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Bake for 15 to 20 minutes or until golden brown.
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Cool on rack, then split into two horizontally.
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In bowl, mix strawberries and 1/2 cup sugar.
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Let sit for 30 minutes.
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Just before serving, whip cream along with 2 Tbsp sugar until cream forms stiff peaks.
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Fold in sour cream and Grand Marnier.
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To serve, spread bottom cake layer with 3/4 of cream mixture.
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Top with 3/4 of the strawberries.
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Put the second cake layer on top and decorate with the remaining cream and strawberries.