In a medium sized saucepan, heat the olive oil and sauté the onion and parsley about 5 minutes. Add 2 cups water and rice; bring to a boil. Reduce heat and simmer, covered, without stirring 14 minutes or until liquid is absorbed. Meanwhile, cook peas in salted boiling water for about 10 to 15 minutes; drain well. Add the peas, sea salt, and butter to rice. Toss well. Turn onto a serving dish and sprinkle with freshly grated parmesan cheese. Makes 6 servings.