Mix the flour, mastiha and salt, and slowly pour the sunflower oil and water until a firm dough is obtained.
Let the dough stand for ½ an hour.
In the bowl of a food mixer, add the sugar, yoghurt, farmer’s cheese, milk cream, honey, mastiha and egg yolk. Beat while slowly adding the baking powder.
Whisk the eggs into a meringue and fold carefully into the bowl.
Coat the tart pan with oil and spread the dough. Pour the filling, level with a spatula and bake in a preheated oven at 160°C for approximately 1 hour.