Although the 3-0 Chelsea game comes close I think I would have to go our recent win against City, sheer lack of numbers and total endeavour by the players.
That game was heavily influenced by some shocking refereeing decisions which undoubtedly enebled the mags to get back into the game..
Regardless of decisions. I've never seen us put four past Arsenal in one half. You might not think it was that great a performance but I do mate.
There are so many to be honest but I'll have the humility to let the ladies concerned tell you which one thought me the best.