To create the finger lime mayonnaise, mix the Praise Whole Egg Mayonnaise, finger limes and lime zest.
For the pickled fennel, boil the apple cider vinegar, sugar and salt. Then, pour over finely sliced fennel.
Combine the prawns and finger lime mayonnaise.
Slice the hot dog buns.
Fill buns with watercress and prawns. Top with pickled fennel.
Garnish with chopped chives. Serve.