Finely chop the cucumber, red onion, cherry tomatoes, celery, garlic, coriander and mint and mix together in a bowl.
Squeeze the limes over the mix and add the tabasco, Worcestershire sauce and celery salt and stir through.
For a thinner Virgin Mary style sauce just add tomato juice or if you prefer a thicker consistency add a half half mix of tomato passata and tomato juice and stir through. Add tomato ketchup to taste.
Stir in peeled, defrosted cold water prawns.
Chop the avocado in half and take the stone out. Scoop out the flesh with a spoon and chop into cubes. Spoon in equal amounts into the bottom of a martini glass and spoon the prawn cocktail mix over the top in each glass.
Peel the shrimps / tiger prawns leaving the heads on. Run a knife down the back of each one and devein.
Heat a pan with a little oil and butter and fry the prawns for about 4 minutes until cooked. Sit three prawns on top of each glass and serve with the tortilla chips.