Easy Slow Cooker Shepherd's Pie Recipe

Ingredients

• 800g shoulder of lamb, diced
• 1½ tbsp plain flour
• ½ tbsp olive oil
• 1 onion, chopped
• 2 stalks celery, chopped
• 2 carrots, peeled and diced
• 3 tbsp tomato purée
• 2 tbsp tomato ketchup
• 2 tbsp Worcestershire sauce
• 4 sprigs rosemary, leaves picked
• 3 sprigs thyme, leaves picked
• 100ml hot lamb or vegetable stock
• 50ml red wine (or replace with the same amount of stock or water)
• 1 x 800g pack mashed potato (shop-bought, or you can use homemade)
• salt and freshly ground black pepper