Wash crablets and drain thoroughly. Remove and discard the carapace of each crablets.
In a clean mixing bowl, combine crablets, rum, salt and ground black pepper.
Mix and marinate for 15 minutes. Sprinkle and mix flour to marinated crablets.
Heat oil in a wok and deep fry crablets until crispy.
Drain excess oil. Serve with vinegar sauce.