Frenford were also celebrating following a 3-0 win at Sporting Bengal, after leaders Woodford Town had beaten FC Clacton 5-0 on Friday night.
But Athletic Newham lost 2-0 at home to Saffron Walden, while Barking were hit for six by Halstead Town and Ilford suffered defeat at West Essex on a weekend of mixed fortunes for local clubs.
Boro had lost three league games in a row and bowed out of the Essex Senior Cup after a 5-1 home loss to Athletic Newham in midweek as they travelled up the A12 to take on the Seedgrowers.
And they produced a superb first-half display to race into a 5-0 lead, with young striker Finlay Dorrell helping himself to four goals.
Dorrell latched onto Kris Newby’s pass to open the scoring with a low shot on 13 minutes, before George Cox controlled a cross from Charlie Morris to double the lead with a shot on the turn.
Dorrell took another Newby pass to fire home the third on 37 minutes, then took Henry Hart’s headed pass in his stride to complete his hat-trick two minutes later.
And he became the first Romford player to score four times since Des Gallen in 2007 – after Jake Anderson had denied Nathan Dennis and Junior Luke had cleared off the line – when finding the net again on 43 minutes.
Morris made it 6-0 within a minute of the restart, but Jack Zielinski headed a reply on 50 minutes.
Boro went 7-1 up when Morris controlled Daniel Nakipov-Getmansky’s pass and fired across the keeper, but Dennis grabbed a second for the hosts before the hour mark.
Neither side could add to the scoreline in the final 33 minutes, but Coggeshall hit a post and saw Anderson make three good saves.
Morris was inches away from completing his own treble, hitting a post, as Boro moved up to fourth in the table.
They are six points behind leaders Woodford, who saw Luke Parrott score twice in the first half of their match with FC Clacton, with Nathan Sollosi making it 3-0 just before the break.
David Gokou-Siakouri got in on the act on the hour, with substitute Yemi Adelani completing the nap hand with 15 minutes left.
Lowly Frenford upset Sporting Bengal after second-half goals from Lewis Francis, Samuel Ince and Dion Johnston sealed victory at Mile End Stadium.
But Barking conceded five times in the first half against Halstead at the Lawtech Stadium, before the visitors struck again in the second half, on a chastening afternoon.
And Ilford found second-placed West Essex too strong at Wadham Lodge, conceding three times in the first half on the way to a 5-0 defeat.