In a large saucepan, combine the rice, 3 cups of water, and 1 teaspoon of the salt. Bring to a boil, reduce heat, cover, and simmer until all the water is absorbed, about 15 minutes. Remove from heat and let sit, covered, 10 minutes.
Meanwhile, heat the oil in a large sauté pan over medium heat. Add the onion, bell pepper, and garlic and cook until lightly browned, 7 to 8 minutes. Add the sausage, peas, paprika, pepper, remaining salt, and cooked rice. Heat through, 2 to 3 minutes. Sprinkle with the scallions, if desired. Serve hot.