Mashed Potatoes with lamb curry - Potato Nation

Ingredients

• 900 g lamb fillet, cut into 3cm cubes
• 2 tbsp vegetable oil
• 2 onions, roughly chopped
• 3 garlic cloves, crushed
• 2 green chillies, finely chopped
• 1 tbsp fresh ginger, grated
• 1 tbsp ground turmeric
• 5 ½ tbsp masala
• 5 ½ tbsp ground cumin
• 1 tbsp chilli powder
• 1 tbsp all-purpose flour
• 6 large tomatoes, roughly chopped
• 400 ml coconut milk
• 600 ml chicken stock
• 250 g baby spinach leaves
• 200 g plain yoghurt
• 6 large potatoes, peeled and quartered
• 75 g butter
• ⅓ cup milk