Use a can opener to cut open the cans of tuna fish, but leave the lid in place. Holding the cans over the sink or a bowl, press the lid into the tuna fish and tilt the can to drain all the liquid. Remove the lids and transfer the tuna fish to a mixing bowl.
Chop (diced small) onion and celery. Then Chop finely Cilantro.
Add chopped onion, chopped celery, chopped cilantro and mayonnaise.
Stir with a fork to combine, breaking up any large chunks of tuna fish as you go.
Add more mayonnaise and this time add salt , pepper and lemon juice.