Drain the tuna well, place in a bowl and mash with a fork. Add the eggs and mix well. Place this mixture on a baking sheet lined with baking paper and put it in the oven preheated to 180 ° C (no convection!) Bake for 15 minutes.
In the meantime, mix the tomato paste with the water, salt, pepper and the herbs of Provence to a creamy sauce. Cut the onion into very fine rings. Likewise, cut the artichoke. Cut the feta cheese into thin strips and grate the parmesan cheese.
Take the tuna bottom out of the oven and spread the tomato sauce on top. Place the capers, artichokes and onions on top of the pizza. On top are the slices of feta cheese and the parmesan is sprinkled on top. Then put the pizza in the oven again for 30 minutes at 180 ° C.