Both goals came in the second half, with the young Reds' captain, Ben Woodburn, breaking the deadlock just before the hour mark.
U18s winger Kaide Gordon, on from the bench, then doubled their lead and confirmed three points with a late strike on his debut at this level.
"It was a great way to end our Premier League 2 campaign," Lewtas told Liverpoolfc.com post-match.
"The lads were brilliant tonight and they worked so hard for each other. We played some great football and created a lot of chances.
"It was great to see Ben get a goal, and it was a really nice moment to see Kaide get a first goal at this level for us."