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Preheat the oven to 425°F
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Sauté the scallions in 3 tablespoons butter until they are soft. Set the scallions aside and let cool.
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Sift the flour, baking soda, and salt into a large mixing bowl. Cut the 1/2 cup butter into small pieces and cut it into the dry ingredients until the mixture resembles coarse crumbs.
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In a small bowl mix together the 3/4 cup buttermilk and the green food coloring, until it is a very dark shade of green.
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Make a well in the center of the flour mixture, and add the scallions and the green buttermilk.
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Mix until a very sticky dough just holds together.
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Turn out onto a floured surface and knead 20 times.
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Pat out until 1/2 inch thick.
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Cut with a 2 inch cutter. Place biscuits on a baking sheet about 3 inches apart.
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Mix the melted butter and buttermilk and brush on the biscuits.
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Bake for 12-15 minutes until golden brown.