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Separate dough into 8 biscuits. Press or roll each to form 6-inch round. Place on ungreased cookie sheet. Place 1 piece salmon on half of each dough round. Spoon about 2 tablespoons potato mixture over salmon on each round, to within 1/2 inch of edge. Sprinkle each with 1 1/2 teaspoons green onion. Fold dough in half over filling; press with fork to seal.