Heat oven to 200 oc (180 fan assisted).
Peel and chop potatoes, place in a pan and cover with water and boil over a medium heat until soft.
Chop Onion and Crush Garlic. Heat a little oil in a pan and fry until soft.
Add Beef Mince and cook until browned.
Add tomatoes and puree and mix through.
Pour in the stock and add chilli and Worcestershire sauce.
Add the peas and mix through.
Cook over a medium heat until the stock has reduced and the mixture has thickened.
Place mince into an oven proof dish.
Drain potatoes and mash with a little milk and butter if desired.
Spread mash over the mince evenly.
Sprinkle the grated cheese over the top.
Cook for 30 minutes until golden and serve.