Cottage pie

Name: Cottage pie
Prep time: 15 min
Cook time: 1 h 30 min
Total time: 1 h 30 min
Yield: 6 portions
Ingredients: 100 g cheddar cheese; 2 garlic cloves; 20 g extra virgin olive oil; 1 large onion; 2 carrots; 2 celery stalks; 1 zucchini; 200 g fresh brown mushrooms; 500 g beef mince; 600 g floury potatoes; 600 g sweet potato; 50 g tomato paste; 40 g plain flour; 80 g water; 1 tbsp Vegetable stock paste; 3 tbsp Worcestershire sauce; 1 tbsp Dijon mustard; ¾ tsp ground black pepper; 1 dried bay leaf; 1 tsp dried mixed herbs; 150 g frozen peas; 30 g salted butter; 100 g full cream milk; ½ tsp sea salt