
Step 1 · Cook the Potatoes
Put the potatoes in a saucepan, cover with cold water and add 1/2 tsp salt. Bring to a boil and simmer for 12 to 15 minutes, until tender.
Step 2 · Brown the Beef
Meanwhile, heat the oil in a large frying pan over high heat. Brown the beef for 5 minutes, breaking it up.
Step 3 · Cook Vegetables
Add the onion and carrots and cook for 4 minutes. Stir in the tomato purée, Worcestershire sauce and thyme for 30 seconds.
Step 4 · Simmer the Mixture
Add the stock or water, beans and remaining salt. Simmer for 5 minutes. Add the peas and cornflour mixture and simmer for 2 minutes until lightly thickened.
Step 5 · Mash the Potatoes
Drain the potatoes and mash them with the butter and milk. Stir 100 g cheddar into the mash.
Step 6 · Assemble and Melt Cheese
Spoon the mash over the beef mixture. Scatter over the remaining 50 g cheese, cover the pan and cook over low heat for 2 minutes, until melted.