Experience the Irish pub classic at home with this savory beef and mushroom pie, enriched with a Guinness stout and topped with golden puff pastry.
In a large pot, heat 2 tbsp of olive oil over medium heat. Add beef and brown on all sides for about 10 minutes; set aside. Heat remaining 1 tbsp of olive oil and cook bacon until it begins to brown. Add onion, carrot, mushrooms, garlic, and sugar. Cook and stir until vegetables are soft and browned, 10 to 15 minutes.
Stir in flour, followed by the Guinness and beef stock. Mix in thyme, bay leaves, and reserved cooked beef. Cover and bring mixture to a boil, then reduce heat to a simmer until beef is tender (about 1 hour and 15 minutes). Stir occasionally and remove cover once beef is tender. Allow stew to boil until slightly thickened (about 15 more minutes).
Create a slurry with cornstarch and water, then mix into the stew. Simmer for 30 more minutes to blend flavors. Discard bay leaves.
Preheat oven to 350°F (175°C).
Spread filling into a 9-inch pie dish. Cut puff pastry into a 10-inch circle and place on top of the filling. Pinch and crimp pastry edges with a fork to seal, then create 2 steam vents with a knife. Brush beaten egg over the top of the pie.
Bake until crust is golden brown (30 to 40 minutes).
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