Hard Boil one egg. Set aside
Clean the anchovy fillets by removing the bones. Place the tuna, the capers, the anchovies in a blender. Mix until smooth. Then add the hard-boiled egg and the bread and continue blending
Wash the tomatoes, Cut off the top. Remove the inside of the tomatoes with a teaspoon. Let the tomatoes stay upside down for a few minutes. Add a pinch of salt and a drizzle of olive oil to the tomatoes
Fill the tomatoes with the mixture. Serve cold