A classical carpaccio, named after a famous Venetian renaissance painter, is made with very thinly sliced raw beef. Here I have used the term for thinly sliced vegetables (or salmon, see Tips).
Using a mandoline or very sharp knife, thinly slice the cleaned porcini. Whisk together the lemon juice, both oils, garlic and mint and season to taste.
Drizzle a tablespoon of the dressing on each of 4 serving plates, then arrange the porcini slices on top, overlapping them attractively. Spoon over the remaining dressing, season with salt and pepper and finally scatter over the Parmesan shavings. Serve with crusty bread.