Tasty cottage pie with parsnip mash

Name: Tasty cottage pie with parsnip mash
Prep time: 1 h 15 min
Cook time: 30 min
Total time: 1 h 45 min
Cuisine: British
Ingredients: 250g packet lean minced beef (12% fat); 2 onions chopped; 4 carrots (about 450g/1lb), peeled and coarsely grated; 2 tbsp Worcestershire sauce; 2 tbsp tomato purée; 2 beef stock cubes dissolved in 425ml/¾pint boiling water; 1 tsp cornflour; 900g potato peeled and cubed; 3 parsnips peeled, cored and chopped; 2-4 tbsp skimmed milk; steamed broccoli or Savoy cabbage to serve