Into a large mixing bowl add the bread and water or milk. Let it soak until softened, just about a minute or so, then squeeze the liquid out of the bread, discard the liquid and return the bread to the bowl. Add the meat, grated onion, garlic, cilantro, Ras El Hanout, ground ginger, and cayenne. Sprinkle in a generous pinch of kosher salt and black pepper. Using clean hands, mix until the meat mixture is well combined.