First of all, add combine 1/2 cup cashews with 1/2 cup water to let it soak for a while.
Next, place all of the black bean mix ingredients into a large mixing bowl and combine all of the ingredients very well. Let it sit aside.
Now take your soaked cashews (including the soak water) and blend with the remaining ingredient for about 2 minutes or until the mixture is smooth and creamy.
Now you are ready to fill your lettuce tacos! Simply take one of your romaine lettuce leaves and fill it with some of the bean mix, then top it with the toppings that you have ready to go. Top with some cashew sour cream. As an optional extra you can also put a bit of hot sauce on top. YUM!