To prepare base, first line a 7x7 inch tin with non-stick parchment or baking paper. In a food processor, combine Nuts, Cacao, Salt, and Dates. Process until you have a moist mixture. If it is too dry, add a few drops of water and process till moistened.
Press mixture into the base of your prepared tin, and then scatter Salted Popcorn over the base. Using your hands, press the Popcorn into the base. Place in freezer for 15 minutes.
Meanwhile, to make the Tahini Caramel, combine all ingredients in a bowl. Whisk till smooth. Pour over prepared base and leave to set in the freezer for 2-3 hours. Some Popcorn may float to the top, that's okay!
After 2-3 hours, combine all ingredients for chocolate topping in a bowl. Either over a bain-marie/double boiler or in the microwave, heat until melted.
Whisk to combine. Let cool for 5 minutes and then pour onto your frozen base. Scatter extra Salted Popcorn bits on top if desired.
Leave in the freezer for a further 1 hour. After 1 hour, remove from freezer and slice with a warm knife.
Bars will store in an air-tight box in the freezer for up to 3 months. Allow to thaw for 5-10 minutes before eating.
Alternatively, store in the refrigerator for up to 3 weeks.