Boil eggs in salted water for 10 minutes.
Peel an onion and finely chop it.
Wash the tomatoes, cut the lid and then dig inside.
Drain the liquid well from them, add salt and let them drain for a few minutes
Remove the canned sardines, remove their oil and main bone.
In a bowl, mix the chopped onion, diced eggs, chopped sardines and mayonnaise.
We can put a little of the pulp removed from the tomatoes but be careful the filling should not be too liquid.
Check for salt, pepper and paprika.
Fill the tomatoes with the filling obtained and decorate with fresh parsley.
Serve with quality bread.