Name: Classic Roast Beef
Prep time: 5 min
Yield: 4
Cuisine: British
Ingredients: Large (about 2kg) British beef roasting joint by Sainsbury’s; 1 tbsp English mustard by Sainsbury's; 1 tbsp plain flour by Sainsbury's; 400ml beef stock, made with 1 beef stock cube by Sainsbury’s; Splash of dark stout (optional)