Heat the nut butter and syrup together in a heavy-bottomed saucepan over medium heat, stirring constantly. When well combined, remove from heat and stir in the cocoa or carob powder until thoroughly mixed.
Pour into a loaf pan or other smallish casserole dish, and sprinkle with the sesame seeds. Using a spatula or back of your (clean!) hands, lightly press the sesame seeds into the fudge.
Let cool for about an hour, then cut into small squares and enjoy!
Life in the kitchen couldnt be easier than this. This fudge is VERY rich, howe'ver, so start with small pieces and chew it well!