In a large skillet, cook beef over medium heat until no longer pink; drain. Stir in chili sauce and soup mix; set aside. , In a large bowl, combine the flour, sesame seeds if desired, and salt. Cut in shortening and cheese until crumbly. Combine milk and vinegar; gradually add to flour mixture, tossing with a fork until dough forms a ball. , Divide dough in half; roll out to 1/8-in. thickness. Cut with a lightly floured 2-1/2-in. round cutter. Place half of the circles 2 in. apart on ungreased baking sheets; top each with a rounded tablespoonful of beef mixture. Top with remaining circles. Moisten edges with water and press with a fork to seal. Cut a slit in the top of each. , Bake at 425° until golden brown, 12-16 minutes. Serve immediately., Freeze option: Freeze cooled pies in an airtight container for up to 3 months. Bake, from frozen, on an ungreased baking sheet at 425° until heated through, 14-16 minutes.