Mexican fish tortillas

Ingredients

• 700g/1½lb haddock fillet

For the marinade

• ¼ tsp black peppercorns

• ½ tsp cumin seeds

• ½ tsp coriander seeds

• ½ tsp dried oregano

• ½ tsp turmeric

• ½ tsp paprika

• ¼ tsp cayenne pepper

• 3 cloves garlic, chopped

• 1 Seville orange, juice only and 1 lime

• or

• 1 lime, juice only and ½ grapefruit

• or

• 1 lime, juice only and 1 Seville orange

• ½ tsp salt

For the tomato salsa

• 450g/1lb ripe tomatoes, deseeded and finely diced

• ½ red onion, finely chopped

• 1 clove garlic, very finely chopped

• 2 green chillis, deseeded and finely chopped

• ½ Seville orange, juice only or ½ grapefruit

• 1 tsp sugar

• 4 tbsp chopped fresh coriander

• salt

• freshly ground black pepper

To serve

• soft flour tortillas

• 150ml/¼ pint soured cream (optional)

• lime wedges