In a medium mixing bowl, toss minced onion with orange juice, vinegar and a pinch or two of sea salt. Set aside for 10-15 minutes allowing the onions to macerate.

Remove pith and peel from oranges. Remove segments of orange, then cut the segments into bite-sized pieces. Add the orange to the macerated onion. Leaving the peels on, slice lemons into quarters, then slice the halves into lovely ultra-thin slices, removing any seeds. Add lemon slices to the salsa bowl. (The lemon slices, with their peels intact, add a wonderful bite to the salsa.)

Add jalapeno and cilantro to the salsa. Toss all ingredients, adding additional sea salt to taste. Cover salsa and refrigerate while preparing your fish tacos.

Just before serving, add cubes of avocado. Toss to coat.