Place cashews in a food processor and puree until a dense “butter” forms (it will look like Play-Doh). Add cocoa, salt, and spices and puree again. Add syrup, buttery spread, and vanilla and puree until thick and smooth. It will become a ball in the processor.
Transfer to a dry work surface and knead the walnuts into the fudge mixture. Shape mixture into a 1-inch- thick square; wrap in plastic and chill for about 3 hours before cutting into squares.
Cook’s Tip: For a softer, creamier fudge, soak cashews for 4 hours and drain well before using in recipe.