Ramsey headed in a pinpoint cross from Mesut Ozil in the 29th minute to put Arsenal ahead, and finished off the victory on a counter-attack in injury time with his 13th goal of the season in all competitions.
The Welshman refused to celebrate these two, though, having started his career at Cardiff, where he made his debut at 16.
In between, Ozil set up the second goal as well, slotting a perfectly weighted pass into the area for the onrushing Mathieu Flamini to hammer into the net in the 86th.
Ramsey headed in a pinpoint cross from Mesut Ozil in the 29th minute to put Arsenal ahead, and finished off the victory on a counter-attack in injury time.
The win puts Arsenal seven points ahead of Liverpool and Chelsea, who both play on Sunday.