Cast Iron Skillet Popeye Pizza Stacey shares a recipes for cast iron skillet popeye pizza. This deep dish pizza uses spinach, gruyere, garlic and olive oil with a simple no-knead dough. 1 10" pizza 2 1/2 cups bread flour 2 teaspoons kosher salt, plus more for sprinkling 1/2 teaspoon instant yeast 1 cup plus 3 tablespoons water 2 teaspoons extra-virgin olive oil, plus more to coat pans and drizzle 1 medium garlic clove, grated 1 ounce grated parmesan 1/3 cup finely grated Gruyère cheese 1 ¾ ounces fresh mozzarella, pulled into shreds 1 ¾ ounces fresh mozzarella, pulled into shreds 4 ounces fresh spinach Generous pinch of fine sea salt Extra-virgin olive oil, for Drizzling