Salt on sweet things is not a trend and not a novelty. It is a mechanism, and
once you know how it works you can stop guessing at combinations and start
predicting them.
What salt actually does to sweetness
Two effects, both well documented:
Salt suppresses bitterness. Chocolate, especially darker chocolate,
carries bitter compounds. Reduce the bitterness and the sweetness and fruit
notes underneath become more prominent. The chocolate does not get sweeter —
you simply stop being distracted from the sweetness already there.
Salt increases perceived intensity. Sodium ions affect how taste receptors
fire, which makes flavours read as more vivid. A salted caramel does not
contain more caramel. It presents what is there more loudly.
This is why a pinch works and a handful does not. Past a certain point salt
stops enhancing and starts being the flavour.
Why potato chips specifically
Chips bring three things to the pairing at once, which is unusual:
Salt, obviously, and distributed on the surface where it hits the
tongue immediately.
Fat, which carries flavour compounds and lengthens the finish.
Chocolate and fried potato share this quality, which is why they blend
rather than compete.
Crunch, against something that melts. Textural contrast is doing at
least as much work here as the taste contrast.
Take any one of those away and the pairing gets noticeably worse. Salted
pretzels lack the fat. Salted nuts lack the shatter.
Kettle-cooked versus regular, and why it matters here
Kettle chips are cooked in smaller batches at lower temperature, which
produces a harder, denser, less uniform chip. For sweet pairing that is an
advantage: the crunch survives contact with something soft, where a thin
standard chip goes limp almost immediately.
If you are dipping rather than eating alongside, kettle is not a preference.
It is a requirement.
Four pairings that work, and one that doesn't
Chips and milk chocolate. The safest starting point. Milk chocolate's
lower cocoa content means less bitterness to manage, so the salt has a
simpler job.
Chips and caramel. The best of the four. Caramel already contains cooked
sugar bitterness for salt to work against, and its stickiness clings to the
chip rather than sliding off.
Chips and a candy spread. The practical version of chocolate dipping —
no melting, no tempering, no bowl of chocolate seizing while you work.
Chips crumbled over ice cream. Under-appreciated. The cold keeps the fat
firm and the chips stay crisp far longer than they do against anything at
room temperature.
Chips and white chocolate — the one that fails. No cocoa solids means
almost no bitterness for the salt to suppress, so you get sweet plus salty
sitting side by side rather than combining. It tastes like two things at once
rather than one thing.
Practical rules
Vinegar chips fight chocolate. Acid and cocoa clash. Sea salt and
vinegar is a superb chip and a poor partner here — save it for caramel,
where the acid cuts the richness usefully.
Assemble immediately before serving. Anything sweet and moist begins
softening a chip on contact. Minutes, not hours.
Salt level beats salt presence. Heavily salted chips overwhelm milk
chocolate. If you are using a strongly salted chip, go darker on the
chocolate to give the salt something to do.
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