Preheat the oven (160° C fan).
Prepare the pastry as defined & roll out as thin as possible.
Add some drops of olive oil to the pan & distribute evenly.
Transfer the pastry into the pan, press slightly around the edge & cut off all overhanging pastry.
Cut the tomatoes in thin slices.
Grate the Gruyère (roughly) - if not already grated when bought.
Mix the eggs with the creme fraiche w/ an egg whip & add salt & pepper.
Add the herbs of Provence & the grated Gruyère - mix w/ a spoon.
Spoon the tomato pesto onto the pastry & distribute evenly.
Spoon the egg mix carefully onto the pesto.
Scatter the tomato slices carefully on top.
Put the tomato tart in the preheated oven for about 40 min.