Beef and Stout Pie

INGREDIENTS

• 7 Tbs. olive oil
• 1 lb. white button mushrooms, quartered
• 2 cups frozen pearl onions, thawed
• Salt and freshly ground pepper, to taste
• 3 1/2 lb. beef chuck roast, cut into 1-inch cubes
• 1 cup all-purpose flour
• 3 garlic cloves, minced
• 2 Tbs. tomato paste
• 2 1/2 cups Irish stout
• 1 cup beef broth
• 1 lb. carrots, cut into chunks
• 1 lb. red potatoes, cut into chunks
• 1 Tbs. finely chopped fresh thyme
• One 16-inch round Stilton pastry (see related recipe at left)
• 1 egg, beaten with 1 tsp. water