Melt the coconut oil in a small saucepan
Add the tahini, cacao powder and honey to a small bowl and mix in the melted coconut oil. Mix until smooth
Pour into a flat container lined with baking paper and sprinkle with chopped walnuts to top
Place into the freezer to set for an hour before slicing
Slice and store in a sealed container in the freezer for up to 3 months