For two people, I had a fillet of ono that was about 2/3 lb. For the sauce, combine the following ingredients and blend in the food processor until they're pureed:
1 cup pineapple
1 cup cilantro leaves
1 tablespoon honey
1 tablespoon lemon juice
1/2 teaspoon ancho chile powder
pinch of salt
If you can't find ono, use tuna, swordfish or halibut.