Prepare all ingredients:
Make a shortcrust pastry.
Leave the dough to rest in the fridge for half an hour.
Drain, roughly flake the tuna meat.
In a bowl, beat the whole eggs.
Add the crème fraîche, salt, pepper, thyme leaves...
...and finally the tuna meat.
Roll out the pastry...
...and line in a silicone tart mold.
Pour this preparation on the bottom of the tart.
Sprinkle with grated Swiss cheese.
Bake for 25 mn in hot oven at 180°C. Serve warm.