Rinse barley and drain. In frying pan, heat two tablespoons butter. Add hazelnuts and stir until lightly roasted. Remove from heat and set nuts aside. Add remaining butter to pan, along with barley and onion. Cook until lightly browned. Stir in nuts, green onion, salt and pepper. Spoon into 1 1/2 quart casserole. (Freeze or chill at this point if desired.) Heat broth to boiling and pour over barley mixture. Stir to mix. Bake at 375ºF for 70 minutes, or until liquid is absorbed. Garnish with parsley and serve immediately.