Ingredients

· 650 ml milk

· 40 g plain flour

· 40 g butter

· 2 teaspoons Dijon mustard

· 150 g mature cheddar

· 180 g frozen peas

· Handful of parsley

· 300 g macaroni

· 300 g fish pie mix

· Green salad to serve

Method

Pour the milk into a pan and add flour and butter. Set over a medium heat and whisk continuously until you have a smooth, thick white sauce. Remove from the heat; add the mustard, most of the cheese, peas and parsley. Meanwhile, boil the pasta in a pan of water until just cooked. Drain. Heat the oven to 200°C. Tip the pasta into the sauce and add half the fish, stir everything together then tip into a baking dish. Top with rest of the fish, pushing it into the pasta a little, and then scatter with the remaining cheese. Bake for 30 minutes until golden, then serve with salad, if you like.