sardines as well . when using fresh fish cook over medium high heat for 5 to 10 minutes after the fish is added.
use yellow or white onions .
slice the onions as thin as possible, and sweat it out by adding salt, do not brown .
if the tomatoes are not tart enough add a few drops of white or red wine vinegar.
do not stir the canned sardines much , they do tend to break easily.
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