If you like to bake—or even if you just think you might like to bake—we strongly encourage you to visit the baking aisle of any grocery store and pick up a roll of parchment paper. This oven-safe, heatproof paper is coated with silicon, giving it nonstick properties that are essential for lining cake pans, baking cookies and filled pastries, and in the case of this recipe, easily rolling out soft dough.
Place a rack in bottom third of oven; preheat to 350°. Place graham crackers in a large resealable plastic bag and zip it up, pressing out most of the air. Using a wine bottle or rolling pin, firmly roll over crackers several times, crushing them into fine crumbs (some larger crumbs are okay).
Measure out 1 cup crumbs (which should be almost all of them) and transfer to a medium bowl. Add salt, ⅔ cup flour, and 2 Tbsp. sugar. Mix with a fork to combine, then add 1 egg and 6 Tbsp. melted butter.
Mix with fork until dough forms, then knead with your hands inside of bowl until no floury spots remain and dough is smooth. It’ll be a little soft and slightly oily, which is fine!
Lightly flour a piece of parchment paper and place dough on top. Lightly flour top of dough, then cover with another piece of parchment.
Using bottle or rolling pin, roll dough into a round (it doesn’t have to be perfect!) about 12" in diameter and ⅛" thick. Periodically peel back parchment and dust with more flour to prevent sticking. Slide entire sheet of parchment paper onto a rimmed baking sheet.
Sprinkle 1 Tbsp. sugar over surface of dough, leaving about a 2" border. Pile strawberries into center of dough and arrange in an even layer, leaving the same 2" border.
Sprinkle strawberries with 1 Tbsp. sugar and drizzle with remaining 2 Tbsp. butter.
Using a microplane or fine grater, grate zest of about one-half of lime over strawberries.
Cut off half of lime with no zest and squeeze juice over strawberries. Save the other half for later.
Beat remaining egg in a small bowl with fork until no streaks remain. Brush egg wash around border of pastry (you won’t use it all).
Using edges of parchment to help lift, fold empty border of dough up and over strawberries, working your way around in roughly 2" sections, overlapping folds as needed. Press all the way around to secure folds and keep dough in place. It might crack or tear in places, but don’t worry! Just pinch it back together.
Brush top of border with remaining egg wash and sprinkle with remaining 1 Tbsp. sugar.
Bake galette until crust is browned around the edges and juices from strawberries are syrupy and actively bubbling, 40–45 minutes. If some juices escape and end up on the parchment paper, don’t worry—the parchment will prevent the tart from sticking. Let cool at least 20 minutes.
Beat cream with a large whisk in a medium bowl until voluminous, thick, and starts to hold tracks of whisk. Hold whisk upright and look for the “peak” of cream that forms on the end. It should droop and slump over—these are “soft peaks,” which are what you want!
Grate zest from remaining half of lime over cream and serve with tart.
Do Ahead: Tart can be made several hours ahead. Let sit at room temperature. Once fully cooled, droop a piece of plastic over top.