01 - Bring the water and salt to a boil in a medium saucepan. Add the orzo and cook according to package instructions (about 8–10 minutes) until al dente. Drain well.
02 - While the orzo drains, melt the butter and olive oil in the same saucepan over medium heat. If using, add the minced garlic and sauté for 30 seconds until fragrant.
03 - Return the drained orzo to the saucepan. Add lemon zest, lemon juice, Parmesan, black pepper, and parsley. If using peas, stir them in now.
04 - Toss everything together until the orzo is creamy and well coated. Season with additional salt and pepper to taste.
05 - Serve warm, garnished with extra parsley and lemon zest if desired.