The tin of anchovies you use should be about 50g / 2 oz. You can save and use the tasty oil for other things, such as pasta sauce (recipe on this site.) For a vegetarian version, use a few capers instead. Walnuts: 3/4 cup, 100g or just shy of 4 oz of shelled. Use fresh bread crumbs, not dried (100g /4 oz / 2 cups). You can use 1 tablespoon of fresh chopped parsley instead of the dried.