just long enough for them to become tender but still bright. Fresh spinach can be stirred in right at the end until wilted.
If you do not have tarragon, you can use a mix of fresh parsley and a little fresh dill for a different but still springlike flavor. For a richer dish, finish with an extra tablespoon of butter and a generous handful of Parmesan.
Leftovers keep well in the refrigerator for a couple of days; the orzo will thicken
