This is so simple, I can't believe I couldn't find it anywhere on zaar. The onion keeps the fish from drying out and gives a lovely mild flavor. We especially like Telipia, but any white fish can be used, as well as any of your favorite fish seasonings. We like lemon pepper or Dominant One (an all seasoning mix from hubby's Indiana hometown spice factory ). Fresh fish from a camping trip is good also, in fact this method is great for outdoors, as it can be cooked on the grill for 20 min, clean up is a snap, just toss the foil.