The Pilgrims' youngsters thrashed AFC Rushden and Diamonds 5-0 at Boston Town's DWB Stadium, with Jordan Tate also on target.
It strengthened United's grip on top spot in the National League U19 Alliance Division H heading into the New Year.
Boston (4-3-3): Harry Payne; James Gordon, Jack Withers, Bailey Forth (George Smith 65), Callum Rodger (Oli Drummond 46); George Hobbins (Maison North 46), Harry Vince (Jenson Ball 60), Jordan Tate; Haydn Havard (Connor Stocks 65), Liam Adams, Jack Brown.