Lightened up Cottage Pie With Golden Mash for 2

Name: Lightened up Cottage Pie With Golden Mash for 2
Ingredients: 250 g extra lean ground beef; 1 stick celery, finely chopped; 1/2 medium carrot, coarsely grated; 1/2 small onion, finely diced; 1 garlic clove, crushed; 2 teaspoons Worcestershire sauce; 2 tablespoons tomato sauce (ktchup); 1 teaspoon dried Italian herb seasoning; 3/4 cup green peas (I use frozen); 1 cup water; 4 teaspoons brown gravy mix; 1/2 teaspoon fresh ground black pepper; 2 tablespoons chopped fresh parsley; 350 g potatoes, chopped into chunks (2 medium); 300 g pumpkin, peeled and seeded, k chopped into chunks; 2 teaspoons butter (I used light Logicol); salt; fresh ground pepper; 2 tablespoons grated parmesan cheese