Shepherd's Pie

Name: Shepherd's Pie
Prep time: 10 min
Cook time: 1 h 40 min
Total time: 1 h 50 min
Cuisine: European, British
Ingredients: 1 garlic clove; 20 g olive oil; 180 g onions; 120 g carrots; 100 g celery stalks; 500 g lamb mince; 30 g tomato purée; 100 g liquid vegetable stock; 1 Tbsp Worcestershire sauce; 1 tsp fine sea salt; ½ tsp ground black pepper; 1 dried bay leaf; 3 sprigs fresh thyme; 800 g water; 800 g potatoes; 250 g leeks; ¼ tsp fine sea salt; 2 pinches ground black pepper; 25 g milk; 25 g unsalted butter