Lansbury, 19, opened the scoring in the 4-1 Carling Cup win over local rivals Tottenham Hotspur, a memorable way to mark his first start after five substitute appearances.
"He has not played for a long time and he is a bit like Ray Parlour - up and down, fantastic engine, good attitude," said Wenger, the Arsenal manager.
"He smells when you have to be in the box. He is a player who is always in there when a cross is coming in from the other side. He always scores goals."
Lansbury made 18 appearances for the Iron on loan in 2009, scoring four goals.