Lancashire hot-pot

Ingredients

• 1 lb lean lamb (trimmed of all excess fat,then sliced)
• 1 garlic clove (crushed)
• 2 tbsp Worcestershire sauce
• 1 onion (thinly sliced)
• 2 leeks (trimmed and thinly sliced)
• 3 carrots (peeled and sliced)
• 1⁄2 lb button mushrooms (halved)
• 1 bay leaf
• 1 small bunch fresh thyme
• 1 sprig fresh rosemary
• 1 lb new potatoes (scrubbed and thickly sliced)
• 2 tbsp tomato paste
• 1 2⁄3 cups diluted salt-reduced or homemade beef or chicken stock (hot)
• 1 3⁄4 oz cheddar cheese (crumbled (optional))