Brown the meat. Add salt and pepper to taste as you cook. In kitchen matters, I often how would Julia handle this? What would Julia do? Julia would taste along the way
Preheat oven to 375°
Remove the meat once fully browned and throw in the carrots and the parsnips. Cook on medium heat for about 10 minutes until softened
Add the leeks and the rosemary and salt and pepper. Cook for another five minutes
Add the thawed peas, and then the beef broth and cook down for five to eight minutes
Add the flour and stir briskly until it coats and incorporates into the mixture
Add the beef and blend completely. Sprinkle some more flour on top and mix down. A nice gravy should start forming in the bottom of the pan
Put into a large greased (I use vegetable oil cooking spray) baking dish and top with the mashed potatoes
Bake for 30 minutes at 375°. Top with cheddar and bake for another 10 minutes