Rice and Peas (Risi e Bisi)

3 cups water
Pinch of salt
1 ½ cups rice
1 cup fresh shelled or frozen green peas (thawed)
1/4 cup rice vinegar

Bring water to boil. Add rice and salt. Return to boil and reduce heat to low. Cook until rice is tender. Just before serving, add peas and vinegar and toss thoroughly.