Recipes

    Ripening

    A fresh cheese tastes of milk. An aged cheese tastes of what happened to milk — and that is not a poetic way of putting it. Essentially every flavour compound in a mature cheese is something that wasn’t there when the wheel went into the cave.

    Ripening is controlled decomposition. Everything below is protein and fat being taken apart by enzymes, slowly enough to be delicious rather than disgusting — which is what the temperature and humidity are for.

    Proteolysis: protein into flavour, and into texture

    The casein network is broken down progressively by enzymes from several sources at once: residual rennet still sitting in the curd, enzymes released by the starter bacteria as they die off, and enzymes from whatever else is growing on or in the wheel.

    Big proteins become peptides; peptides become amino acids; amino acids get converted further into an enormous range of aromatic compounds. That cascade is most of what “flavour development” means.

    But proteolysis does something else that people notice sooner: it changes the texture. The casein network is the structure of the cheese, so taking it apart softens the paste. It’s why a young Camembert is chalky in the centre and a ripe one is spoonable — the network in the middle has been progressively dismantled from the rind inwards.

    And it’s the mechanism behind the bitterness problem. Some short hydrophobic peptides taste intensely bitter. Controlled, specific proteolysis produces few of them; indiscriminate proteolysis produces many. That is exactly why a less specific coagulant turns an aged cheese bitter, and why excess rennet does too — the surplus enzyme stays in the wheel and keeps cutting.

    Lipolysis: fat into sharpness

    Fats are broken into free fatty acids, and those are responsible for the sharp, piquant, sometimes peppery notes — pecorino, provolone, and the general “bite” of a well-aged cheese.

    Short-chain fatty acids in particular are pungent, and they are why goat and sheep cheeses taste distinctly of goat and sheep: those milks contain a different fatty-acid profile to begin with, so lipolysis produces a different set of compounds.

    This is also why skimmed-milk cheese is dull rather than merely lean. Fat is not just texture; it’s the substrate for a whole branch of the flavour chemistry, and if it isn’t there, those compounds never appear.

    Lipase, added deliberately, accelerates exactly this — which is its appeal and its danger. Too much and the free fatty acids read as soapy or rancid, and it cannot be undone.

    🔴 The crunch: two different crystals, constantly confused

    The crunchy bits in aged cheese are the thing people ask about most, and nearly every explanation treats them as one phenomenon. They are two different substances with two different causes, and telling them apart is genuinely useful.

    Tyrosine crystals

    Tyrosine is an amino acid. As proteolysis runs over months and years, free amino acids accumulate, and some — tyrosine especially, being poorly soluble — crystallise out inside the paste.

    • Firmer and crunchier. These are the ones that give a real pop when you bite.
    • Found in the interior of long-aged cheeses: Parmigiano-Reggiano, aged gouda.
    • They are a direct proof of age and of proteolysis. You cannot fake them and you cannot rush them.

    Calcium lactate crystals

    Completely different origin: calcium binding with lactic acid as the cheese ages.

    • Softer, paler, and much more common.
    • They form in the interior and on the surface — and the surface ones are the white patches on a cheddar that get mistaken for mould and thrown away.
    • Cheddar typically has these. They are not a sign of great age.

    Both can occur in the same cheese; Parmigiano and aged gouda often carry both.

    Neither is mould. Neither is salt. If you take one thing from this page: those white specks on your cheddar are almost certainly calcium lactate, and the cheese is fine.

    I like this pair because it’s a genuinely useful diagnostic. Crunchy pop in the paste of a two-year wheel = tyrosine = your proteolysis has run properly. Soft white bloom on the surface of a cheddar = calcium lactate = cosmetic. Same “crystals,” entirely different reports on your cheese.

    What you’re steering with

    The variables that decide how all this proceeds are the ones on the previous pages:

    • Moisture — the master control. More water, faster everything.
    • Salt — the brake. Under-salt and ripening runs away.
    • pH — sets enzyme activity and how much calcium is holding the network together.
    • Temperature — the low fifties. Too cold and you dry the cheese out before it develops; too warm and fats go rancid and the paste slumps.
    • Time, which is the only one you cannot substitute for.

    Inside-out or outside-in

    Worth knowing because it explains the shapes cheeses come in.

    Surface-ripened cheeses — bloomy and washed rinds — are broken down by organisms living on the outside, and their enzymes work inwards. The ripening front moves from the rind toward the centre, which is why a Camembert is runny at the edge and chalky in the middle when young, and why these cheeses are made small and flat: a big wheel’s centre would never be reached.

    Interior-ripened cheeses — cheddar, alpine, grating cheeses — ripen more or less evenly throughout, because the agents are distributed through the paste rather than living on the surface. Which is why these are the ones that can be enormous.

    Blue is the interesting exception: it’s interior-ripened by an organism that needs air, which is why the wheel gets needled to give it channels to breathe through.

    Next: rinds and moulds — who’s living on the outside, and which ones mean throw it out.

    Sources

    Comments (0)

    1. Loading…

    Comments are held for moderation — nothing appears until approved.