In omelette-making, the pan is everything; find a non-stick pan large enough to spread your eggs out into a large circle. Crawfish tails are sold frozen in 1-pound packages or, even better, peel your own. You might be inclined to spice this up with cayenne or a splash or two of hot sauce, but I would urge you to keep this dish delicate and let the herb and crawfish flavors shine. If you have a whole crawfish, use it for garnish in the center of the plate, and if not, a sprig of parsley will do just fine.