Slow Cooker Steak and Gravy Pies

Bahan-bahan (6 porsi)

• 21 oz chuck steak (or stewing beef, diced)
• 2 tablespoons flour
• 2 tablespoons olive oil (divided)
• 1 large brown onion (peeled and roughly chopped)
• 4 cloves garlic (peeled and crushed)
• 4 sprigs fresh thyme
• 14.8 oz can Guinness stout (or sub with beef stock, or 2 cups other dark stout beer)
• 15 oz can crushed tomatoes
• 2 tablespoons vegetable stock powder (optional but enhances the flavour)
• 1 teaspoon salt and pepper to taste
• 3 sheets puff pastry (defrosted)
• 1 large egg (whisked)