Fish ceviche

My knowledge of ceviche expanded considerably while on a fishing trip to Costa Rica. On a bit of a mission as far as this fashionable culinary oddity was concerned, I ordered it at three meals in a row. All three were miles apart in presentation and taste. Costa Ricans treat mahi mahi, sea bass and snapper to this form of brief pickling, but too much onion, citrus and coriander can overpower the fish. The third version worked best as we were left to add as much or as little of these powerfu