As society knows, ramen is one of the most essential and quickest foods to make. It only requires boiled water and the packet of noodles. It is almost impossible to fail at cooking ramen, and thus one can conclude that it is very easy to make ramen.
Therefore, the phrase "works like ramen" means
"To do with ease or little to no effort. To work every time with out failure."
"If you just run the pick and roll, you'll get the ball every time. Trust me, it works like ramen."
Guy1: "All I have to do is slip it on and I won't have any babies in 9 months?"
Guy2: "Yeah, It works like ramen"