Preheat the oven to 150°C, then grease and line a tin with baking paper
Rub 1 cup cold, cubed cannabutter into the flour with your hands until the mixture resembles fine breadcrumbs
Add in sugar and mix up some more
Push the mixture into your parchment-paper-lined pan evenly
Bake for 30 minutes, and then leave to cool
While it's baking, use remaining cannabutter, 200ml Bailey's, condensed milk and syrup in a saucepan. Use medium heat, and mix until smooth.
Bring it to a boil, until it's nice and thick
Allow to cool for 5 minutes, then pour overtop of the shortbread mix and leave it to cool completely.
Melt all of the chocolate togethe rin a double boiler.
Pour directly overtop of your pan, and let cool in the fridge.