My usual add-on: If you decide to go for industrial chocolate bars available at supermarkets, do try Novi. Their gianduja is really good. Or, to have the experience that
Perche described above, buy a chocolate bar (they carry different ones) at Eataly, and make sure to buy one with more than 60-70% cocoa. In that case try one without milk or anything else. But careful: more calories than any plate of pasta.