Pulse in a food processor until crumbly. Mix well to ensure the miso is fully distributed through the tapenade.
Taste and adjust flavors. More miso will give it more body. More pepper flakes will give it more heat. Try Aleppo Pepper instead of red pepper flakes for an earthier taste.
Let sit in the refrigerator to allow the flavors to meld and develop. It is even better the next day, so if you can, make it the day before though you may have to make extra so there is some left for dinner.