An indulgent artisan dessert, beautifully crafted with premium ingredients and presented with exquisite garnishes for a memorable finale.
Boil the sugar, water, and citric acid to 115C (soft ball stage), then let it cool to about 40C without stirring.
Gently warm the tahini with the vanilla in a large bowl until fluid and easily stirred.
Pour the cooled syrup in a thin stream over the tahini, beating continuously with a wooden spoon.
As the mixture thickens and turns streaky, beat in half the pistachios, then press the halva into a buttered pan.
Chill for several hours until firm, then cut into slices and top with the remaining pistachios.