Lalawele opened the scoring with a header inside 2 minutes, then set up Wome Senome for a simple tap-in on 20 minutes with the Nigeria defence stranded high up the pitch.
Ikechukwu Ibenegbu reduced the arrears five minutes later before adding to his tally from the spot when Ehiosu was sandwiched by two defenders. He scored his second from a penalty on 45 minutes.
But a goalkeeping error from Sunday Rotimi allowed Lalawele to claim his second of the evening from a free kick, and the Hawks held on in front of a stunned crowd.
Both teams finished with 10 men when defenders Gege Soriola and Duro-Akoriko were dismissed in either half. Defeat ended Samson Siasia's run of five consecutive wins, and also denied him his first trophy as Super Eagles coach.