Good b4 or after a meal according to your taste and tradition. I have also served this as a salad course with some baby mixed greens tossed with a little oil and salt. And no one says you can't just sit in front of the TV and have a snack of it with a hunk of italian bread :-) If you have rosemary infused oil then you can use it instead of the oil and rosemary, saving a few steps and 2 hours of time. Cook time is the steeping time. Use your favorite Pecorino, I go for a nice Tuscan one at the cheese shop but a Pecorino Romano at the grocer. I have no idea where the 16 walnut halves came from. Just use your own taste as a guide as to how many nuts to use or don't use any, its still good without.