Microwave the butter for 30 seconds till melted
Add in your stevia/sweetner to taste, vanilla essence and the coco powder and mix well together
Add in the almond flour and combine till well incorporated
Divide the mixture in 3 tart tins or ramekins and shape the base
Bake at 175 C/ 350 F for 10 minutes and then allow them to cool
Heat 2 tablespoons of water and mix 1 tsp of instant espresso powder into that
Whip the mascarpone cheese, stevia, vanilla extract and coffee mixture together till nice and fluffy
Pour the mascarpone mixture over the base and chill in the fridge for 15 minutes
Meanwhile warm up the cream for 30 seconds in the microwave and add the chocolate and sweetner to that and mix till fully melted and you have a creamy ganache
Pour the ganache over the mascarpone mousse in the tart molds and chill in the fridge for an hour
Finish with some sea salt on top of each tart.