The panino torinese is a Piedmontese sandwich built on the city's two anchors, and what defines it is a mild local cheese set against a pungent anchovy-and-garlic dressing. Toma piemontese is a soft to semi-firm cow's-milk cheese, gentle, milky, and faintly grassy. The Turin condiment tradition runs to bagna càuda and its relatives, warm emulsions of anchovy, garlic, and oil so savoury they border on aggressive. The two need each other in bread: the toma is calm and creamy with little salt of its own, the anchovy dressing is salt and umami and a hard garlic bite, and the whole sandwich works because the cheese gives the pungent sauce a soft body to land on while the sauce gives a quiet cheese a reason to be there. Either alone is unbalanced; together they hold.
The craft is in measuring an assertive condiment and protecting the bread from an oily one. The loaf is a Piedmontese roll such as a biova or a sturdier country bread, firm enough that an oil-rich dressing does not turn it to paste. The toma is sliced thick enough to stay a distinct creamy layer rather than melting away under the sauce. The anchovy dressing, whether a true bagna càuda reduced thick or a simpler anchovy-and-garlic paste, is applied in a thin, deliberate streak, never spooned in loose, because too much would both overpower the cheese and soak the crumb from within. A few leaves of bitter green or a strip of roasted pepper can sit between them as a textural and bitter counter. The build is eaten promptly, before the oil works through and slackens the bread that is doing the holding.
The variations stay Piedmontese and turn on which side leads. There is the build carried by a full warm bagna càuda with the toma as a cooling layer, the one weighted to the cheese with only a faint anchovy thread for salt, and the version that swaps toma for a sharper castelmagno against the same garlic-and-anchovy base. Each is the same mild-cheese-and-pungent-dressing logic with one element moved, and each deserves its own article rather than being crowded in here.