Further strikes from Russell Goldstein and Steve Summers added the gloss as the east Londoners secured their fourth consecutive league win.
RJC boss Jon Jacobs told JC Sport: "We made a great comeback against a very strong and youthful Lions side.
"They will do extremely well if they can keep that 11, as well as a few older heads, and have a squad that can beat anyone."
Kiki Levin and Josh Weiner had put Lions in front and boss James Gershfield told JC Sport: "We started the game very well and with only 11 players and no subs we rushed into a 2-0 lead.
"But then an injury to Richard Gold left us with 10 and it was always going to be an uphill battle from there."