In a skillet, cook beef, tomato, onions and garlic over medium heat until meat is no longer pink; drain. Stir in salt, red pepper flakes and thyme. In a small bowl, combine cornstarch and broth until smooth. Add to meat mixture. Bring to a boil; cook and stir for 2 minutes or until thickened. Remove from the heat. On a floured surface, roll pastry into two 12-in. squares. Cut each into four squares. Spoon about 1/4 cup meat mixture in the center of each square. Moisten edges of pastry with egg; fold over filling, forming a triangle. Press edges with a fork to seal. Place on ungreased baking sheets; prick tops with a fork. Bake at 425° for 10-15 minutes or until golden brown.
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