2 tablespoons olive oil
1/2 cup thinly sliced scallions (white and pale green parts)
1 small leek (white and pale green parts only, thinly sliced)
1 1/2 cups pearled barley
1/2 cup white wine
4 cups chicken or Parmesan Stock
3 cups fresh, shelled English peas
1/4 cup minced fresh tarragon or dill
1/4 cup minced fresh flat leaf parsley
  grated zest of 1 lemon
  Salt and freshly ground black pepper
  freshly grated Parmesan cheese (optional)