Laldanmawia Ralte (52nd, 65th minutes) scored a second-half brace while Mahmoud Al Amnah (14th) drew first blood early on.
Eduardo Ferreira (19th) scored his second goal of the season with Yusa Katsumi (79th, penalty) also getting on the scoresheet.
For the visitors, Samuel Lalmuanpuia (87th) netted a consolation goal when all was over for them.
After the 0-1 loss to arch-rivals Mohun Bagan, Khalid Jamil and his charges were under pressure to deliver and they did it in style against a side who came into the game with two wins in two games.
Courtesy the result, East Bengal jumped to third position in the points table from seventh with four points from three matches. Lajong remained second with six points from three outings.
It was all East Bengal in the first period, and justly they took the lead as early as the 14th minute.
Syrian midfield mainstay Al Amnah did all the work, making his way into the box after receiving a throw in and then wrong footed Lajong's Laurence Doe to shoot with the ball taking a small deflection off Rakesh Pradhan to go in.
Five minutes later, the hosts doubled their advantage riding Ferreira's powerful header from Katsumi's corner.
The Japanese playmaker claimed a penalty moments later when he was brought down inside the area by Juho Ho but referee waved play on.
Tempers flared around the half-hour mark when Al-Amnah was hacked down in midfield and both teams exchanged war of words.
Plaza though failed to get back to form, wasting a free header from close off Katsumi's cross before halftime.
After the break, there was no change of script as the red and gold brigade scored two more goals to put the match to bed.
Laldanmawia Ralte scored both the goals, first rounding goalkeeper Phurba Tempa Lachenpa to slot the ball into an empty net after the superb Al-Amnah set him up with a sublime pass, and then making the most of a defensive error to double his tally.
Katsumi put the icing on the cake from the spot after Phurba got a hand to the ball but could not keep it out of his goal.
Lalmuanpuia scored late on but it was scant consolation for the Highlanders as they succumbed to their first reversal of the season.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
About VDC
Doraiah Chowdary Vundavally is a Software engineer at VTech . He is the news editor of SocialNews.XYZ and Freelance writer-contributes Telugu and English Columns on Films, Politics, and Gossips. He is the primary contributor for South Cinema Section of SocialNews.XYZ. His mission is to help to develop SocialNews.XYZ into a News website that has no bias or judgement towards any.