Vegan Chocolate Fudge with Walnuts

Ingredients for about 2 dozen squares of Miracle Fudge:
1/2 cup really good unsweetened cocoa (I used this one)
1/2 cup real maple syrup
1/2 cup melted coconut oil
1/2 cup walnuts, chopped and lightly toasted
few drops of vanilla
pinch of salt