Mini Beef and Blue Cheese Pies | culture: the word on cheese

Ingredients

• 2 tablespoons cornstarch
• ¼ cup warm water
• 1½ pounds boneless beef chuck roast (trimmed, and cut into 1-inch cubes)
• Kosher salt (to taste)
• Ground black pepper (to taste)
• 2 tablespoons vegetable oil
• 1 large yellow onion (diced)
• 3 cloves garlic (minced)
• 2 ribs celery (diced)
• 2 small carrots (diced)
• 12 ounces dark beer
• 2 cups beef stock
• 2 teaspoons Dijon mustard
• 1 bay leaf
• 2 tablespoons unsalted butter
• 10 ounces white button mushrooms (stemmed and quartered)
• 14 ounces puff pastry (thawed)
• 1¼ cups frozen peas
• 6 ounces Stilton (crumbled)
• 1 egg (lightly beaten)