Drain all juice from prawns lay them on some kitchen paper to dry out

Squeeze juice from half lemon – keep the other half to slice for garnish.

Make the sauce by mixing together mayonnaise, tomato ketchup, double cream, Worcestershire sauce, lemon juice and a pinch of paprika.

Taste and add seasoning to taste

Mix prawns into the sauce (keep a few back to garnish the cocktails)

Shred lettuce leaves and peel and slice the avocado.

Either layer the lettuce, prawn mixture & avocado in a cocktail glass or ring the changes and serve in a complete lettuce leaf.

Garnish with paprika, prawns and lemon wedges.