His first came from the penalty spot but his second was a piece of sublime skill.
The Gabon international rounded Kurt Zouma with ease before lofting the ball over Blues keeper Willy Caballero.
Mikel Arteta may have only been given his first managerial job earlier this season but he already has claimed a trophy.
And his players have celebrated in their own special way – with Torreira and Martinez going to McDonald’s.
The two Argentinians wore beaming smiles as they held aloft their fast food.
Martinez has been a surprise star with the Gunners in recent matches after Bernd Leno suffered a season-ending injury.
After spending his whole professional career at Arsenal, at 27 he has now been given his longest run in the starting XI.
Arsene Wenger signed him 10 years ago and the keeper has admitted leaving his family as a teenager was tough.
He had said: “At that time I was living in Buenos Aires and playing for Independiente and I would only see my family twice a month because they couldn’t afford the petrol to drive from their home in Mar Del Plata.
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“So when Arsenal offered to buy me, I had to be brave.
“I was 17-years-old and I said ‘yes’ for my parents.
“We came from a poor, poor family and for them to see me winning a trophy and getting a medal would be something special.”
After a largely derisory season from the Gunners, Arsenal find themselves still in Europe next term despite finishing eighth.
It sees Arteta win a trophy in his first campaign in management.
And fans will hope the former Manchester City assistant is backed in the transfer market to build on a fine start.