Step 1 If you have uncooked prawns, pan-fry them quickly in a non-stick pan. Set aside to cool.

Step 2 Chop the prawns into small chunks, discarding the tails. Combine the prawns and crab in a large bowl. Add all the other ingredients except the rice paper rolls. Stir everything together well.

Step 3 Combine the dipping sauce ingredients in a small bowl.

Step 4 Fill a large, flat basin or bowl with warm water. You can now put this, plus the rice paper rolls, dipping sauce and the bowl of prawn salad on the table, and let everyone dig in and make their own rolls or parcels. Just dip the rice papers in the water until they become soft and pliable. Put on a plate and fill with salad, then wrap or roll up. (Or you can pre-make the parcels and refrigerate them until you're ready to eat.)

Step 5 Other nice dipping sauces are sweet chilli, peanut, and soy sauce.