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In 10-inch skillet, cook beef over medium-high heat 5 to 7 minutes, stirring frequently, until thoroughly cooked. Stir in taco seasoning mix and salsa; simmer 5 minutes. Spoon about 1/4 cup/50 mL meat mixture in center of 1 dough rectangle. Sprinkle with 2 tablespoons/25 mL cheese. Fold rectangle over to form triangle; press edges with fork to seal. Place on cookie sheet. Brush with egg; sprinkle with cornmeal. Repeat with remaining dough and filling.