Ingredients
1¾cupscheese crackers,baked
1cupall purpose flour,plus more for dusting
1tspkosher salt
1tspfreshly ground black pepper
8tbspunsalted butter,cubed, chilled
1cupcheddar cheese,shredded
1tspapple cider vinegar
3tbspcold water
2tbspdijon mustard
⅓cupcheddar cheese,shredded
3heirloom tomatoes,varying colors, thinly sliced
1tbspfresh thyme leaf,plus more for garnish
1shallot,thinly sliced
½tspkosher salt,plus more to taste
½tspfreshly ground black pepper,divided
1large egg,beaten
6tbspsour cream,for serving
Preparation
Add the cheese crackers to the bowl of a food processor. Pulse for 20 to 30 seconds, until the crackers are broken down into crumbs.
Add the flour, salt, and pepper to the food processor and blend for 20 to 30 seconds to incorporate into the cracker crumbs.
Add the butter and cheddar cheese and blend for 30 to 60 seconds, until the butter is broken down into pea-sized pieces.
Transfer the mixture to a medium bowl. Add the apple cider vinegar and 3 tablespoons of cold water and mix with hands to combine. Add more water, 1 tablespoon at a time, until the mixture holds together well, feels slightly damp, and does not crumble when pressed.
Shape the dough into a disc and tightly wrap in plastic wrap. Chill in the refrigerator for 1 hour.
Preheat the oven to 375 degrees F.
Lightly dust a clean surface and a rolling pin with flour. Set the chilled dough on the floured surface and begin to roll out the dough, starting from the center and working outwards, applying even pressure.
Rotate the dough as it is rolled, using a bench scraper, as necessary to keep the dough from sticking to the surface. If the dough begins to feel sticky, lightly dust with more flour.
Roll the dough out to ⅛ to ¼-inch thick. The dough should be wide enough to fit into an 11-inch tart pan with some excess dough overhanging.
Wrap the dough around the rolling pin and transfer to the tart pan, gently draping it over. Press the dough down into the bottom of the pan and up the walls.
Roll the rolling pin over the top of the pan to trim the edges. Transfer the tart crust to the refrigerator to chill while cutting out dough strips for the top.
Gather the excess dough into a ball. Shape the dough in a rectangle and roll out to about 4 inches wide and 12 inches long, ⅛- to ¼-inch thick.
Using a pastry cutter, trim off any excess dough to get an even rectangle. Cut out ¼-inch and ½-inch-wide strips of dough. Transfer dough strips to plate and transfer to the refrigerator while you fill the tart crust.
Remove the tart pan from the refrigerator and spread the mustard over the bottom of the crust. Cover the bottom of the crust with the cheddar cheese.
Add a layer of tomato slices, overlapping slightly. Sprinkle with ¼ teaspoon of salt, ¼ teaspoon of pepper, ½ tablespoon of thyme, and half of the shallots. Repeat with a second layer of tomatoes and the remaining ¼ teaspoon of salt, ¼ teaspoon of pepper, ½ tablespoon of thyme, and shallots.
Remove the dough strips from the refrigerator, and create a decorative lattice design over the tart.
Brush the beaten egg all over any exposed dough, including the edges around the tart pan.
Bake the tart for 40 to 45 minutes, until the crust is a deep golden brown and crisp to the touch.
Let the tart cool for 20 minutes to allow the tomato juices to absorb.
Serve with a dollop of sour cream and fresh thyme leaves. Enjoy!
