Line a 20–23 cm (8–9in) springform tin with baking paper. The smaller tin will make a deeper cake with a thicker base and vice versa for the larger tin.
Blitz the biscuits in a food processor until they turn to crumbs. Melt the butter, add the salt, then blend again until the crumbs start to clump together. Tip the crumb mixture into the tin, then flatten into an even layer using a large serving spoon. Refrigerate while you make the filling.
In a large bowl, beat the cream cheese, sugar and vanilla using an electric hand mixer, in a stand mixer with the whisk attachment or with a hand whisk until combined and smooth. Add the cream and tahini, then beat again until just combined – don’t overmix. Scrape the mixture onto the biscuit base, then level it out to cover the base evenly. Chill for at least 3 hours or overnight.
To serve, drizzle the surface with date molasses and scatter with your choice of sesame-coated peanuts, broken sesame snaps or crumbled halva, or a combination for extra flavour and texture.