The 29-year old forward then added the Gunners' fourth 11 minutes from time, before rounding off the rout at the death with an assist from Ramsey.
On his potent strike-force, Emery added: "It is one process, to know better after training, after every match, after every decision, how we are better on the pitch, between the players, in our tactical system and impose our timing on the pitch in possession with the ball".
It was Arsenal who nearly regained the lead less than three minutes into the second half but Bettinelli pulled off a great save to deny Bellerin from the edge of the box.
Arsenal started the season poorly and lost their opening two league games.
The Gunners are growing in confidence under Emery and are undoubtedly on track for a top-four challenge, while Lacazette's form comes as a major plus. They are just two points above the bottom three, too.
Emery stated: "Yesterday he came in with pain and he can not train yesterday or play today". He only lasted 54 minutes.
Government Announces Relief On Fuel Prices By Reducing Excise Duty
On Thursday, the price of petrol was raised by 15 paise a litre while that of diesel was hiked by 11 paise a litre. The state of Karnataka, who earlier slashed fuel prices by Rs 2, will not be announcing any more cuts.
Fulham are the only side in the Premier League yet to keep a clean sheet this season and it was easy to see why as Arsenal carved holes in the hosts' creaky five-man defence.
Twitter reacted to Arsenal's victory and here are some of the best tweet.
"We finished the game with 21 shots, and the other team nine".
After the worldwide break, Arsenal resume their Premier League campaign at come against Leicester City on October 22, before a Champions League clash away at Sporting Lisbon and a London derby with Crystal Palace.
Finally he met Pierre-Emerick Aubameyang's low cross with a delicate flick with the inside of his boot to beat Marcus Bettinelli in the Fulham goal and conjure memories of the sort of goals Dutch great Johan Cruyff used to score.
"For us and the players in the worldwide break they are going to play Wednesday, Thursday and travel".