Preheat the oven to 350°F (175°C).
In a bowl, combine flour, sugar, and salt for the crust. Add diced butter and mix until the mixture resembles coarse crumbs.
Add ice water gradually until the dough comes together. Press the dough into a tart pan and prick the base with a fork.
Bake the crust in the preheated oven for 15 minutes or until lightly golden. Remove and let cool.
Combine lemon juice, Limoncello, sugar, eggs, and heavy cream in a bowl, whisking until smooth.
Pour the lemon mixture into the cooled tart crust.
Bake for 30 minutes or until the filling is just set and slightly wobbly in the center.
Let the tart cool to room temperature, then refrigerate for at least 2 hours before serving.