1. Place a large saucepan on the stove; add the 3 tbsp olive oil and heat.

2. Remove the beef from the packet and dry well on kitchen towel.

3. Season the beef with a little pepper, then, gently brown in the hot olive oil.

4. Once well browned, add the packet of vegetables straight from the freezer.

5. Mix well, then add the zest and juice from the oranges, potatoes, water and a little more pepper and mix really well.

6. Bring to the boil, then turn the heat right down to a simmer, place a lid on the saucepan and simmer for between 1½-2 hours, or until the beef is really tender, but not falling apart.

7. Once cooked, add the gravy granules and stir until thickened, then serve.

8. I like to serve my casserole with a large spoonful of pickled red cabbage.