1. Wash the zucchini and cut them into large cubes. Sauté them in a pan with a little olive oil for 10 minutes over medium heat, adding a little water if they start to stick.
2. Cut the goat cheese log into thin slices. Line the bottom of a round cake pan with 3 tablespoons of pesto and place 9 slices of goat cheese on top. Mix the zucchini with 3 tablespoons of pesto, season with salt and pepper, and spread it over the goat cheese slices.
3. Cut the remaining goat cheese slices in half or quarters and add them on top of the zucchini.
4. Prick a pie crust with a fork and then place it upside down over the zucchini.
5. Bake in the oven for 20 minutes at 200°C (400°F), then broil for 5 minutes to brown the crust if necessary. Let it cool for 5 minutes outside the oven, then unmold the zucchini and goat cheese tatin onto a serving dish.