British Beef and Onion Pie

British Beef and Onion Pie
by Jamie Oliver 

1 lb. ground beef
3 carrots, diced
2 onions, diced
3 celery stalks, diced
1 tbsp. Worchestershire sauce
1 tsp. mustard
~2.5c. beef broth
2 tbsp. flour
2 pie crusts

Sautee carrots, onion, celery in a bit of olive oil until thoroughly softened and slightly brown. Add beef and brown until cooked through. Add 2 tbsp. flour to thicken the mixture. Add beef broth and thoroughly stir until it's a gravy consistency, adding more if needed. Put in a dish and top with the TWO pie crusts. Unroll them on top of each other and roll together. Bake at 350 for 40 minutes.