Orient got off to a bright start with Trialist B powering home the opener on the third minute, and goals continued to flow with Abrahams grabbing two before the 20th minute mark.
Trialist B then claimed his second of the night on the 30th minute, before Abrahams continued his fine form with another three goals in the closing minutes of the half.
Following the restart midfielder Steven Alzate added an eighth with just under 25 minutes remaining, and the scoring was completed by second-year scholar Ruel Sotiriou who notched a brace in the closing stages.
Having ran out 6-1 victors at Harlow Town on the weekend, Head Coach Steve Davis named a youthful starting XI for the trip to Leslie Field Stadium with defender Michael Clark captaining the side.
From the first whistle Orient looked the brighter side, and with only three minutes on the clock made the breakthrough as Trialist B rifled home an unstoppable strike in off the underside of the crossbar.
The O’s dominated possession throughout the opening exchanges, and having spurned a few attacks then doubled their advantage through striker Tristan Abrahams who latched onto a loose pass inside the Burnham half and showed great composure to score in his second successive game.
Abrahams was looking threatening every time he touched the ball, and with 18 minutes played grabbed his second goal in brilliant fashion as he curled a beautiful strike from outside the area beyond the reach of the goalkeeper and into the top far corner.
Despite boasting such a comfortable advantage, the O’s continued to push forward and added a fourth when Trialist B cut inside from the right to drill home his second of the night.
As the half drew to a close, Abrahams showed a clinical eye for goal by claiming his hat-trick on the 37th minute having combined well with Josh Koroma.
With literally minutes remaining of the half, Abrahams was then on hand to claim his fourth and fifth goals of the evening as the O’s went into the break with a seven-goal advantage.
During the break, Orient made one change as second-year scholar Ruel Sotiriou came on in place of Abrahams, before defender Jake Caprice replaced Myles Judd soon after the restart.
Wholesale changes were then made on the hour mark as no less than eight substitutions being made, and it took midfielder Steven Alzate only a matter of minute to join in the act as he turned well and drilled a precise shot home.
Sotiriou came into the game on the back of notching a hat-trick for the under-18s on Saturday, and the young forward continued his rich vein of form by benefitting from a wonderful pass from Alzate to race into the area and confidently stroke home the O’s ninth.
As the match entered the final 10 minutes, Sotiriou was on hand to complete a clinic night for Orient by notching his second with a close-range finish after fellow striker Macaulay Bonne had been denied by the post.
ORIENT: Sargeant (Grainger 60), Judd (Caprice 48), McLean (Pollock 60), Clark (C) (Happe 60), Scales (Widdowson 60), Trialist A (Ochieng 60), Barker (Lee 60), Alderson (Alzate 60), Koroma (Bonne 60), Trialist B, Abrahams (Sotiriou 45)
GOALS: Trialist B (3 & 30), Abrahams (13, 18, 37, 43 & 45), Alzate (66), Sotiriou (69 & 81)