In a skillet, combine first 5 ingredients. Cook over medium heat, stirring often, until beef is browned and onion is tender.
Separate crescent dough into triangles; cut each one in half diagonally. Place 1 rounded teaspoon beef mixture in center of each triangle; fold dough over mixture. Press edges with a fork to seal. Place on ungreased baking sheet. Bake at 375° until golden, about15 minutes.
Serve with sweet-and-sour sauce and hot mustard sauce if desired.
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