1Cook potatoes in salted water to cover.
3Mash in large bowl with butter, milk and season to taste with salt and pepper.
5Saute beef until browned, stirring to keep meat crumbly.
6Season to taste with salt and pepper.
7Add tomatoes, mushrooms, parsley, tomato paste, worcestershire and gravy.
9Add peas and cook about 5 minutes.
10Turn mixture into casserole.
11Spread potatoes evenly over meat.
12Bake at 400 degrees 40 minutes until top is crispy brown.