Prepare Pie Crust: Roll out the chilled dough, line a greased 9-inch pie tin, and trim edges. Prick with a fork, line with parchment, add pie weights, and bake at 190°C (374°F) for 20 minutes. Remove weights and bake 15-20 more minutes until golden. Cool completely.
Make the Filling: In a saucepan, whisk together soy milk, sugar, and cornstarch. Cook on low-medium heat, whisking constantly, until thickened. Remove from heat.
Melt the Chocolate: Stir in vanilla, salt, and finely chopped dark chocolate. Whisk until melted and smooth. Add cubed vegan butter and mix until silky.
Assemble & Chill: Let the filling cool slightly, whisking occasionally. Pour into the cooled crust and refrigerate for at least 4 hours (or overnight) to set.
Make the Meringue: Beat reduced aquafaba until soft peaks form. Add sugar gradually and beat until glossy stiff peaks form.
Top & Torch: Spoon the meringue over the set pie and use a blow torch to lightly toast the peaks.
Serve & Enjoy! Keep leftovers in an airtight container in the fridge for 2-3 days.