In my opinion prosciutto di parma is slightly better than Jamon Serrano but the best is Jamon iberico by far.
Iberico ham is also expensive in Spain.
Serrano is the best value for the money.
All excellent, though personally my favourite is a
good Parisian cooked ham, except that most sadly it's near impossible to find even in France, whereas the "mostly OK", and average or poor quality variants are everywhere ; so that even for the French, either an Italian, Spanish, or French raw or smoked ham will be the best available. Freshly-cooked ham is even harder to find !!
But a good Parisian cooked ham served simply with some young boiled potatoes sprinkled with a little black pepper and olive oil, perhaps salt to taste, yummy !
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I've lost weight on every Camino, sometimes a great deal of it ; but
not on the Way to Rome, where despite the 25 to 65 K hiking days, I gained about 5 kilos, as the food really is just that amazing, and they provide it so generously too ...
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I've only rarely had a pilgrim menu or menu del dia or single course meal with vino tinto or whatever to dislike on the Camino -- I like a good pilgrim menu, perhaps because food on the Way most days consists of a little bread plus a variety of fillings + fruit and veg, from what's available and what I feel like, so the
menu del peregrino seems like an enjoyable change rather than the same old day after day as I've heard some describe it.
The "bread plus" diet is BTW hands down superior in France to either Spain or Italy -- the French sausages and cheeses and hams and pâtés and terrines and etc etc are simply amazing once you've worked out how to choose between them for both daily variety and local variations, and although the Spanish and especially Italian veg and fruit tends to be better when you buy locally, the French aren't bad with theirs either. The Italian version of the "bread plus" diet anyway is simply called a pizza.