Drizzle some olive oil into a pan and add half of the sliced potatoes. Season with a pinch of salt, add half of the rice, half of the cooked onions, half of the tomatoes, half of the parmesan, season with some salt, repeat all the layers once more. Top with shredded cheese and clams. Pour chicken stock into the pan.
500 g 1 pound de-shelled pre-cooked clams, 2 ½ cup chicken stock, 250 g ½ pound potatoes, peeled and sliced thinly, 1 cup tomatoes, 1 ¼ cups camolino rice, ⅓ cup parmesan, ½ cup sharp cheese