Blackberry Shortcake on Barbara Gugnoni's Lime Shortcake Biscuits - Litchfield Farmers' Market

Ingredients

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• ½ cup sugar
• Grated zest from 1 lime
• 2¼ cups all purpose flour
• ½ teaspoon salt
• 2½ teaspoon baking powder
• ⅛ teaspoon baking soda
• ½ cup (1 stick) butter, cut into cubes and refrigerated until very cold
• ¾ cup buttermilk
• 1 whole egg
• 1 egg yolk
• 1 egg beaten with a little milk for glazing
• 1 quart of blackberries, washed and dried
• 16 oz. heavy cream, whipped
• 9 Lime Shortcake Biscuits