Preheat oven to 400°F. Line a baking sheet with parchment paper.

Cook ground beef in a skillet until almost browned. Add onions and cook until soft. Add garlic and cook for one minute.

Stir in ketchup, mustard, Worcestershire sauce, salt, and pepper. Simmer two minutes. Remove from heat and cool slightly.

Stir in shredded cheese.

Cut each pastry sheet into six rectangles. Place six on the baking sheet.

Spoon filling into the center of each pastry, leaving edges clear. Brush edges with egg wash.

Top with remaining pastry rectangles, press edges, and crimp with a fork. Brush tops with egg wash. Sprinkle sesame seeds if desired.

Bake 17–22 minutes or until golden brown.

Cool slightly and serve warm with dipping sauces.