Put the rice, stock and water in a pot, bring to a boil, cover, and reduce heat to a simmer. Cook 18 minutes. Put the peas in bowl to defrost while the rice cooks.
Whisk together the lemon juice, garlic and extra-virgin olive oil; add to a blender with the basil, parsley and tarragon and puree.
Fluff the rice with a fork and add to the bowl with the peas. Pour the dressing over the top and toss to combine; serve or chill.