Marinade for Fish or Shark

Here is a marinade I stitched together from the internet and experiment that seemed to work well:
Take almost all of a Negro Modelo, a ping-pong ball sized amount of cilantro, a bunch of salt and pepper, about a 1/2 cup of chopped red onion, just a dab of minced garlic. Put these things in a ziplock bag. Squeeze a lime in there, and then toss in the lime remnants. Then throw in a pound of fish, zip it up, toss it about, and let it sit for a while and you will impress all.