Pre-heat oven to 375 degrees Fahrenheit. Line a baking sheet with parchment paper or grease with cooking spray and set aside.
In a large skillet over medium-high heat, brown the ground beef.
Drain the fat from the pan, then add in the onion and cook until softened.
Stir in the vegetables, thyme, Guinness, Worcestershire sauce and seasonings then bring to a boil.
Reduce heat and simmer for 7-8 minutes or until vegetables are tender.
Roll out pastry dough and cut out 16 - 5 inch rounds and 16 - 5.5 inch rounds.
Spoon filling onto 5 inch rounds, brushing milk around the edges and cover with the 5.5 inch rounds and press with a fork to seal.
Bake 12-15 minutes until pastry is golden, and serve warm.
