HENDERSON'S SHEPHERD'S PIE - Henderson's Henderson's

Ingredients

• 25g oil
• 1 large onion, finely chopped
• 500g minced lamb
• 15g plain flour
• 2 bay leaves
• 2 sprigs of fresh thyme
• 400g tinned chopped tomatoes
• 50g frozen peas
• 2 tbsp Henderson's Relish
• 450ml lamb stock
• Salt and pepper
• 700g potatoes, peeled and quartered
• 75g butter
• 55ml milk
• 1 egg yolk