With a brush, cover the edges of the dough with oil. Spread a quarter of the caramelized onions over the entire surface and sprinkle with the cheese. Bake one pizza at a time for about 12 minutes or until the crust is golden brown. Remove the pizza from the oven and garnish with the watercress, duck, and figs. Generously season with pepper and drizzle lightly with olive oil. Repeat with the remaining ingredients.