Combine the rice, chicken stock, water, lemon juice, 1 t. lemon zest and salt in a saucepan. Bring liquid to a boil. Cover, reduce heat to low and simmer until rice is tender and liquid is absorbed (about 45 minutes for brown rice and 15 minutes for white rice). Add the peas for the last 5 minutes of simmering time.
Remove rice from heat. Fluff with a fork and stir in green onions, parsley, black pepper and remaining lemon zest.