Preheat oven to 400°F (200°C).

Heat the olive oil in a pan over medium heat.
Add the garlic and leeks and cook until they are tender but still crisp (about 2 minutes).
Stir in the mint and orange zest, season with salt and pepper, then let cool.
Combine the leek mixture and the goat cheese.

Roll out the pastry on a floured surface to a rectangle about 20 x 50 cm (8″ x 20″).
Place it on a baking sheet lined with parchment paper.
Divide the cheese mixture in half.