1. Preheat the oven to 180°C (350°F).
2. Unroll the pie crust into a tart pan lined with parchment paper.
3. Prick the bottom with a fork.
4. Spread the mustard on the bottom of the pie crust in the pan.
5. Clean the tomatoes. Slice them thinly.
6. Peel and thinly slice the zucchini as well.
7. Also, slice the goat cheese into rounds.
8. Arrange the tomato, zucchini, and goat cheese slices on the mustard-covered pie crust in the pan, alternating them in a nice pattern.
9. Season with salt and pepper to taste, then drizzle with a little coconut oil.
10. Finally, sprinkle with chopped basil or Herbes de Provence.
11. Bake the tomato, zucchini, and goat cheese tart for 25 to 30 minutes, until golden brown.