It is less useful for ash which has yet to fall and instead is distributed, in clumps and layers, at various altitudes and thus in different wind conditions through a large patch of atmosphere.
Add to that the extraordinary talent in the kitchens of Dublin's Michelin-starred restaurants as well as in hole-in-the-wall cafes in the countryside, and you have nothing less than a culinary rebirth, a phoenix rising from the coal ash, deliciously.