Step 1

1. Put the lemongrass, onion, garlic, ginger, chillies, seeds, paprika and sauce in a processor or blender and mix to a thick paste.

Step 2

2. Place the pork in a bowl, sprinkle with the fish sauce and 1/4 teaspoon ground black pepper.

Step 3

3. Place the potato and onion in another bowl, add 3 tablespoons of the paste and toss to coat. Add the remaining paste to the pork. Mix well.

Step 4

4. Heat the oil in a frying pan or wok over medium heat. Add the pork and cook in batches, stirring, for 8 minutes, or until the meat begins to brown. Remove from the pan. Add the potato and onion and cook, stirring, for 5 minutes, or until soft and starting to brown.

Step 5

5. Return the meat to the pan and stir in 750 ml (26 fl oz/3 cups) water, adding 250 ml (9 fl oz/ 1 cup) at a time. Stir in the mango chutney, then reduce the heat and simmer for 30 minutes.