Prep the cups of a standard size muffin tin with nonstick cooking spray or butter. Set aside.
Combine the flour, powdered sugar, and salt in a food processor, stand mixer or by hand until fine crumbs form. Add the egg and 1 tablespoon of water; mix just until a dough forms. Roll the dough to 1/1/4 to 1/8 inch thickness on a lightly floured surface. Using fluted, round, or flower shapes, cut 12 circles from the dough and press into the muffin cups. Prick the bottom of the shells with a fork and chill while preheating the oven to 350℉.
Bake for about 10 minutes, or until the shells are slightly puffed and the surface looks dry. Let them cool slightly, remove carefully from the pan, and let cool completely while making the filling.
Mascarpone Pastry Cream
Beat the whipping cream and powdered sugar until soft peaks form. Add the mascarpone, lemon zest, and vanilla and continue to whip just until stiff peaks begin to form. If you beat too long and the cream becomes a little grainy, fold in a splash of cream. Transfer to a piping bag or baggie with the corner snipped off.
Strawberry Rose Tarts
Pipe pastry cream into the cooled tart shells and refrigerate while prepping the strawberries.
Prep the strawberries by creating strawberry roses. I used this video tutorial to cut them into roses. Alternatively, you can add thinly sliced or chopped strawberries to the top of each tart.
Just before serving, place a strawberry rose in the center of each tart. Drizzle with honey if desired and add a few sprigs of fresh mint leaves for garnish. Refrigerate until ready to serve.
Notes
Making Ahead: The shells can be made in advance (and even frozen if desired), and the mascarpone pastry cream can be made, covered, and refrigerated up to 2 days in advance. The strawberries should be used just before serving.