📖 Instructions

1. For the Pastry Crust: Start by chilling everything: your butter, a large mixing bowl, and even the flour. Seriously, cold is your friend here!
2. For the Pastry Crust: In that chilled bowl, whisk together the all-purpose flour, granulated sugar, and salt. Make sure it’s well combined; you don’t want a salty patch in your crust, do you?
3. For the Pastry Crust: Cut the very cold unsalted butter into small, ½-inch cubes. Add these butter pieces to the flour mixture.
4. For the Pastry Crust: Now, with a pastry blender, two knives, or even your fingertips, work the butter into the flour until the mixture resembles coarse meal with some pea-sized pieces of butter still visible. This is crucial for flakiness. Don’t overdo it, or your crust will be tough. Sometimes, it just needs a little extra coaxing.
5. For the Pastry Crust: Slowly drizzle in 3-4 tablespoons of ice water, one tablespoon at a time, mixing lightly after each addition. The dough should just barely come together when squeezed. You might not need all the water, or you might need a tiny bit more. The goal is to avoid a sticky mess.
6. For the Pastry Crust: Gather the dough into a disc, wrap it tightly in plastic wrap, and refrigerate it for at least 30 minutes, or up to 2 days. This resting period lets the gluten relax and prevents shrinkage during baking.
7. For the Strawberry Rhubarb Filling: In a large bowl, gently combine the sliced fresh strawberries and chopped rhubarb. If your rhubarb pieces are super thick, cut them a bit smaller so they cook evenly.
8. For the Strawberry Rhubarb Filling: In a separate small bowl, whisk together the granulated sugar, cornstarch, and a pinch of salt. The cornstarch is our thickening agent here, making sure your tart isn't a soupy mess.
9. For the Strawberry Rhubarb Filling: Pour the sugar-cornstarch mixture over the fruit. Add the lemon zest and vanilla extract. Toss everything gently with a rubber spatula until the fruit is evenly coated. Try not to smash the fruit; we want nice, distinct pieces.
10. For the Strawberry Rhubarb Filling: Set the filling aside while you roll out the crust.
11. Assembling the Tart: Preheat your oven to 400°F (200°C). If you have a baking stone or steel, place it in the oven to preheat as well; it helps with a crisp bottom crust.
12. Assembling the Tart: Lightly flour a clean work surface. Remove the chilled dough from the fridge and unwrap it.
13. Assembling the Tart: Roll the dough into a 12-inch circle, about 1/8-inch thick. Don't press too hard, and rotate the dough often to prevent sticking. If it cracks, just gently pinch it back together. Remember, rustic is good!
14. Assembling the Tart: Carefully transfer the rolled-out dough to a 9-inch tart pan with a removable bottom. Gently press the dough into the bottom and up the sides of the pan. Trim any excess dough, leaving about a ½-inch overhang. You can crimp the edges if you're feeling fancy, or just press them against the rim for a simple look.
15. Assembling the Tart: Prick the bottom of the crust several times with a fork. This helps prevent puffing.
16. Assembling the Tart: Pour the strawberry rhubarb filling into the prepared tart shell, mounding it slightly in the center. Dot the top with small pieces of cold unsalted butter (about 1 tablespoon total). This little trick adds richness and helps brown the top.
17. Baking the Tart: Place the tart pan on a baking sheet (this catches any potential drips, saving you from scrubbing your oven).
18. Baking the Tart: Bake for 20 minutes at 400°F (200°C).
19. Baking the Tart: Reduce the oven temperature to 375°F (190°C) and continue baking for another 30-40 minutes, or until the crust is golden brown and the filling is bubbly and tender. If the crust edges start to brown too quickly, you can cover them loosely with aluminum foil.
20. Serve and Enjoy: Once baked, remove the tart from the oven. Let it cool completely on a wire rack for at least 2-3 hours before slicing. I know, I know, the wait is tough! But seriously, this cooling time is important for the filling to set properly. If you cut it too soon, it'll be a runny mess, and nobody wants that.
21. Serve and Enjoy: Carefully remove the tart from the pan by pushing up the removable bottom.
22. Serve and Enjoy: Slice and serve warm or at room temperature. A scoop of vanilla bean ice cream or a dollop of fresh whipped cream is absolutely divine with this tart!