When measuring flour, we spoon it into a dry measuring cup and level off excess. (Scooping directly from the bag compacts the flour, resulting in dry baked goods.) It’s best to use frozen spinach for this recipe; it’s easier to squeeze liquid out from frozen, so there’s less chance of the fatayer being soggy. Squeeze the water out by either placing it in a fine-mesh strainer and pressing down on it with the back of a wooden spoon, or by wrapping it in cheesecloth and twisting to wring it out.