Mix the prawns, tomatoes, mayonnaise, tomato purée and Worcestershire and Tabasco sauces. Taste and season.
Follow the method for finger food wraps using the butter as the ‘glue’. Lay 2–3 whole lettuce leaves on the wrap, then a line of prawn mix and roll up tightly. Wrap in cling film and chill for at least 1 hour. Slice