Fish patties

Name: Fish patties
Prep time: 20 min
Cook time: 25 min
Total time: 45 min
Cuisine: Indian
Ingredients: 250 g (9 oz) potatoes; 3 tbsp plus 500 ml (17 fl oz/generous 2 cups) oil, for deep-frying; 1 medium onion, finely chopped; 3 garlic cloves, finely chopped; 2.5 cm (1 inch) piece of ginger, peeled and finely chopped; 1 tsp ground turmeric; ½ tsp ground cumin; ¼ tsp ground cinnamon; ¼ tsp ground cloves; 1 tsp ground black pepper; 300 g (10½ oz) fresh tuna (steamed and flaked) or canned tuna (drained weight, broken into chunks); 1 tbsp dill, finely chopped; 2 tsp salt; juice of ½ lime; 300 g (10½ oz/ 2⅓ cups) plain (all-purpose) flour; ½ tsp salt; 3 tbsp butter; 1 egg yolk; 60 ml (2 fl oz/¼ cup) coconut milk