Preheat your oven to a suitable temperature for baking.
Prepare the heirloom tomatoes by slicing them as needed.
In a mixing bowl, combine the wheat flour and butter, then mix until crumbly.
Gradually add the water to the flour mixture, stirring until a dough forms.
Roll out the dough and place it in a tart pan, ensuring it covers the bottom and sides.
Arrange the sliced tomatoes on top of the dough in a decorative pattern.
Drizzle with olive oil and balsamic vinegar, then sprinkle with chili flakes, lemon zest, and chopped basil.
Top with slivered almonds for added texture.
Bake in the preheated oven until the crust is golden and the tomatoes are tender.
Allow to cool slightly before serving.
