A buttery shortcrust shell is filled with a dark chocolate ganache blended with tahini, giving this tart a rich, slightly nutty flavor alongside the bittersweet chocolate. The tart requires some chilling time to set the filling properly, so plan for about 2 hours in total. It serves well at room temperature.
Prepare the Crust: Preheat your oven to 350°F (175°C). In a mixing bowl, combine flour, cocoa powder, and salt. Add sugar and melted butter, and mix with a spatula until a dough forms. Press the dough evenly into a 9-inch tart pan. Use the back of a spoon to smooth it out. Bake for 15 minutes until firm. Allow to cool.
Make the Filling: In a saucepan over low heat, bring the heavy cream to just under a boil, then remove from heat. Add chopped dark chocolate, letting it sit for a minute. Stir until completely smooth. Mix in tahini and vanilla extract until well combined. The ganache should be glossy and smooth.
Assemble the Tart: Pour the chocolate-tahini filling into the cooled crust. Gently smooth the top with a spatula. Refrigerate for at least 2 hours, or until set.
Serve: For a decorative touch, drizzle extra tahini over the top or garnish with a sprinkle of sea salt. Serve chilled, cutting the tart with a sharp knife wiped clean between slices.
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Notes
For a nut-free version, replace tahini with sunflower seed butter.
For a richer flavor, let the tart come to room temperature before serving.