Arsenal had finished the first half of the North London derby the better side having taken the lead through Kevin Wimmer’s own goal.
But Tottenham refused to lie down and quickly equalised after the break.
Mousa Dembele’s excellent run into the Arsenal box provoked Laurent Koscielny into a rash tackle, and Spurs were awarded a penalty.
Harry Kane stepped up to mark his return to the side with a hugely important goal, his fifth goal in five league appearances against Arsenal.
Here’s the goal.