Pour oil into a pan and sauté the cuttlefish, monkfish, prawn tails, tomatoes, chopped sweet red pepper and artichokes. Once the ingredients have been sautéed, add the rice and saffron. Next, pour the fish stock you prepared earlier and bring it to a boil on high heat. After 10 minutes, lower the heat, add the clams and simmer for a few minutes until the rice is cooked.