Orzo With Mushrooms - With poultry

225 g orzo pasta 454 g white mushrooms , sliced 3 tablespoons olive oil 3 green onions , minced (set aside the green of 1 for the garnish) 1/2 cup chicken[...]

1/2 leek 1 tablespoon butter 1 tablespoon extra virgin olive oil 1/3 cup celery , roughly chopped 1 cup packed parsley , roughly chopped 3/4 cup onion ,[...]