Mix flour and salt together in mixing bowl. Using a pastry cutter, cut butter into flour mix until incorporated. Slowly add water and mix by hand until mix forms a ball. Roll dough until the desired thickness is reached then bake dough in tart shell at 350° until done. We used muffin tins to create individual portions.
Melt butter in pan and add leeks, cooking until tender. Add saffron and continue to cook for two minutes to release flavor. Remove pan from heat and add remaining ingredients.
Fill tart with mix and cook at 350° until done (toothpick inserted comes out clean).