After a goalless first half, the Pilgrims took control after the break and scored three times inside a 21-minute spell.
Will Langford opened the scoring with a free-kick, with Kris Zaluzinskis and Luke Horne (penalty) completing the comprehensive win.
Boston: Daniel Martin, Rueben Fogg, Josh Doran, Will Langford, Ellis Perry-Burdett, Charlie Brooks, Nathan Bowen, Kris Zaluzinskis, Joe Wilkinson, Lucas Turrell (Luke Horne 68), Hugo Hunt (JJ Ward 81).