Start by making the crust. Combine the flour, sugar, and petals of butter in a bowl. Use a pastry cutter or your fingertips to mix until the mixture resembles coarse crumbs. Next, add the egg yolk and ice water. Mix gently until a dough forms, then shape it into a disc and refrigerate for at least 30 minutes.

While the dough chills, preheat your oven to 375°F (190°C). This way, you’ll have it ready to go once your dough is set.

Once your dough is chilled, roll it out on a lightly floured surface until it's about 1/8 inch thick. Carefully transfer it to a tart pan, pressing it into the corners. Trim excess dough hanging over the edges.

In a large bowl, toss the sliced pears with lemon juice, vanilla, sugar, and cornstarch. The cornstarch will help thicken any juices released during baking. Make sure each piece is coated well.

Spoon the pear mixture into the prepared crust, arranging the slices neatly. This is where you get to be an artist! Make it look beautiful; it’s part of the fun.

Bake in the preheated oven for about 35-40 minutes or until the pears are tender and the crust is golden brown. The aroma wafting through your kitchen? That’s the subtle sign of deliciousness.

Once baked, allow your tart to cool for a bit before slicing. Serve warm or at room temperature, with your favorite complements like ice cream or whipped cream.