Foryoueats: Beef and Mushroom Pie (3 in 1)

Ingredients

• 1 sheet ready rolled puff pastry (25cm x 25cm / 10" x 10"), thawed
• 1 egg , lightly beaten
• Pie Filling:
• 2 cups shredded beef cheeks from Slow Cooked Beef Cheeks in Red Wine leftovers
• 1 1/2 cups leftover sauce from Slow Cooked Beef Cheeks in Red Wine
• 2 tbsp olive oil
• 1 onion (brown, white or yellow), diced
• 2 garlic cloves , minced
• 2 carrots , diced roughly to the size of peas (about 1 1/2 cups)
• 1 cup frozen green peas
• 1 cup canned crushed tomato
• 1 1/2 cups sliced button mushrooms
• 3 tbsp tomato paste
• 1 cup water
• 1 tsp thyme (dried)
• 1 tsp oregano (dried)
• 1 tsp salt , plus more to taste
• Black pepper