1.Shell and devein prawns, leaving tails intact. Combine prawns, juice and coconut milk in medium bowl. Cover; refrigerate 1 hour.
2.Meanwhile, make peanut dipping sauce. Combine nuts, juice, stock and coconut milk in small saucepan; bring to a boil. Reduce heat, simmer, uncovered, 5 minutes. Blend or process with peanut butter and sauce until smooth.
3.Drain prawns; reserve marinade. Holding prawns by tail, coat in flour then reserved marinade, then in coconut. Heat oil in wok; deep-fry prawns, in batches, until brown. Drain.