Use-it-up shepherd’s pie jacket potatoes

Name: Use-it-up shepherd’s pie jacket potatoes
Prep time: 15 min
Cook time: 2 h 10 min
Total time: 2 h 10 min
Yield: 6 portions
Ingredients: 6 potatoes; 2 tbsp sea salt; 20 g extra virgin olive oil; 60 g Parmesan; 3 garlic cloves; 1 large onion; 1 carrot; 1 celery stalk; 200 g fresh mushroom; ½ tbsp fresh rosemary; 50 g tomato paste; 1 tbsp Vegetable stock paste; 20 g Worcestershire sauce; ½ tsp ground black pepper; 300 g leftover cooked lamb; 150 g frozen peas; 2 tbsp cottage cheese; 150 g grated cheddar cheese