When aged Parmigiano Reggiano has tiny crunchy white spots, what are those specks most likely telling you?

Answer: Tyrosine crystals formed

Salt grains stayed whole — Common guess, but wrong: the white crunch is not simply salt that stayed granular. Parmigiano Reggiano is salted in brine, yet the famous spots inside aged pieces are tied to amino acids freed during protein breakdown. That is why they become a maturity clue rather than just a measure of how salty the wheel is.

Tyrosine crystals formed ✓ — Right: they are usually tyrosine crystals. As milk proteins break apart during maturation, tyrosine can become free and concentrated enough to crystallize. The official FAQ identifies the white spots this way, and an independent explainer makes the same salt-versus-tyrosine distinction for shoppers.

Milk minerals clumped — Plausible, but wrong: white crunch in food can make people think of mineral grains. In aged Parmigiano Reggiano, the named crystals are tied to tyrosine released by protein breakdown, not random milk minerals clumping together. The memorable twist is that a defect-looking dot can be a maturity signal.