Bring a saucepan of water to the boil and add the
prawns. Cook for 4 minutes.
Drain well and rinse
with cold water. Peel the prawns. Chop two-thirds of
the prawns, leaving the remaining prawns whole.
Cover and chill.
Beat the cream cheese until
creamy. Add the sour cream, onion salt and black
pepper, beating until smooth. Spread the mixture
onto a serving platter, shaping into a 12.5cm/5in
circle.
Cover and chill for at least 30 minutes. Combine the
chili sauce, Worcestershire sauce,
lemon juice and horseradish in a small bowl. Stir
well, and spread over the cream cheese round.
Sprinkle the chopped prawns over the
chili sauce
mixture and top with the whole prawns. Chill
before serving.