In a double boiler add the following ingredients: coconut oil, dark chocolate, cacao butter and salt.
Let them slowly melt for a few minutes until combined into a chocolate paste. Make sure to keep a low temperature in the double boiler, avoiding to overheat the chocolate paste.
Remove double boiler from heat and set aside to cool down until we take care of the other half of the recipe.
In a separate bowl, add cashew butter with raisins and mix until the raisins have incorporated.
Once the chocolate paste is at room temperature (but still liquid) pour it on top of the cashew-raisins paste.
Using a silicone spatula, mix gently until the chocolate paste has combined with the cashew-raisins paste. You should end-up with a thick dark-brown base for your fudge.
Transfer into a glass or ceramic dish (with a flat bottom) and move in the fridge for a few hours to solidify.
Remove from the fridge when solid and use a big knife to cut into square like portions. Using a big knife will allow you to cut the portions from one single stroke, and this is great since this fudge has a soft texture.
Remove the portions one by one, paying special attention not to ruin their shape, as this fudge tends to be a bit sticky.
Place all the portions on a big plate and move to the fridge, until you decide to consume them. This fudge can be safely stored in the fridge for 4-5 days, even as long as one week.