First of all, a little about Mahi Mahi. This is a actually considered to be a dolphinfish, although I'd feel really guilty eating a cute dolphin. It is found in off-short temperate, tropical and subtropical waters worldwide. I know my dad catches them yearly off of Costa Rica. According to the Natural
Resources Defense Council (NRDC) Mahi Mahi is a a "moderate mercury" fish. They suggest you eat six servings or less during a month.
Bake to eating it.... baking and grilling are the only acceptable ways to really eat Mahi Mahi. It is similiar in texture to swordfish and holds up well to grilling and marinating. It has a much milder flavor, falling between cod and swordfish. Definitely not one of those "fishy" fish.
I prefer to grill mine and use flavors to highlight the natural lightness of the fish.
In this marinade, I use the juice from 1 whole grapefruit. I suppose its up to you if you want to use Red or White grapefruit. In my experience, white is hard to find up here in New England, so I generally get stuck using the Red or Pink Grapefruits. No real difference, just a bit sweeter. With the grapefruit, I add in some freshly grated ginger and minced garlic. I know what dried spices are sometimes easier to keep on hand, but there is something about fresh that just tastes better. I also love to utilize the herbs in my herb garden, so I add in cilantro and chives. I don't know what it is about chives, but they give food a nice hint of onion and garlic flavor without it being overpowering or having to put a giant chunk in the food. Sometimes I feel like they have a little heat behind them. But nobody else in my family agrees on that one. Then of course, I add fresh ground pepper and some ground sea salt.
Grilling Mahi Mahi isn't a science. Its rather basic. After marinading for at least 30 minutes (Be sure to flip the filet over so that both sides of the fish get the marinade), I grill on medium high for about 6 minutes on one side, and then flip and grill for about 4-5 minutes on the other side. You can check to see if its done by looking to see if it flakes apart. Be careful not to over cook this fish.