Gritty - Cheese Science Toolkit (2024)

Gritty

Science Byte

Why do some soft washed rind cheeses get a sandy/gritty rind?

Let’s get this out of the way upfront – IT’S NOT SALT! While on a flight yesterday, working on a cheese presentation, the person next to me mentioned how much they loved "stinky" washed rind cheese. The inevitable gritty rind discussion came up, and prompted this post. Washed rind cheeses can often have a gritty rind, and lots of popular press sources seem to blame it on salt. (examples here, here, and here) It’s an easy trap to fall into since these cheeses are often washed with a brine solution during aging (thus the name: “washed rind”), but the cause of the grittiness is much more interesting. Salt crystals aren’t to blame, but other even cooler crystals are the cause of the grittiness.

Gritty - Cheese Science Toolkit (1)

You can see the crystals sparkling on the surface of this cheese.

Thus far, a few types of crystals have been found on the surface of washed rind cheeses. The main ones being calcium carbonate, magnesium ammonium phosphate, and calcium phosphate. You can take a look at this paper for more information. I should mention there may be multiple forms of these crystals, but let’s just talk about it broadly. You’ll notice sodium chloride isn’t mentioned (i.e. salt).

Gritty - Cheese Science Toolkit (2)

An example of some magnesium ammonium phosphate crystals. Here they're being seen under some filters, in reality they are just transparent.

The surface bacteria that are growing on rinds of these cheeses deacidify the cheese. As the acidity goes down (i.e. pH goes up), this can cause minerals to precipitate and form crystals. All the necessary pieces of these crystals are easily available when making washed rind cheeses. Calcium, phosphate, and magnesium are all found in milk and cheese (and water to some degree). Carbonate and ammonium are fancy words for carbon dioxide and ammonia gas, which are naturally created by the surface microbes as these cheeses are aging. You add all these together, you’re left with a gritty rind!

Note: this post is about soft washed rind cheeses like Taleggio or Époisses. There might be other things going on with firm washed rind cheeses like Gruyère, no one's looked into the rinds of those yet.

Gritty - Cheese Science Toolkit (2024)

FAQs

Why does my cheese feel gritty? ›

Calcium, phosphate, and magnesium are all found in milk and cheese (and water to some degree). Carbonate and ammonium are fancy words for carbon dioxide and ammonia gas, which are naturally created by the surface microbes as these cheeses are aging. You add all these together, you're left with a gritty rind!

How do I fix my gritty cheese sauce? ›

Adding an acid such as a couple of tablespoons of lemon juice or white wine and whisking like the Hounds of Hell are snapping at your fingers may emulsify the fat molecules back into the sauce while detangling the protein molecules that have merrily clumped into unappetizing grainy clusters.

What cheese has a gritty texture? ›

The Complexity of Cheese

Ikaite has been observed almost exclusively in very cold marine environments, while struvite has been found in organic-rich environments such as guano caves. Both are likely associated with a gritty mouthfeel in washed-rind cheese.

At what pH does soft cheese coagulate? ›

Soft cheeses, such as cream cheese, coagulate slowly. As bacteria produce lactic acid, the other layer of the casein micelle becomes less and less polar. The micelles begin sticking together at around pH 5.3, with full coagulation after 24 hours, at pH 4.6.

Is grainy cheese safe to eat? ›

They're most likely calcium lactate crystals, also known as “cheese crystals.” They are completely safe to eat, and usually signify that a cheese is flavorful and well-aged. Calcium lactate crystals form naturally during the aging process and are most commonly found in aged cheddars, including Smoked Medium Cheddar.

What are the gritty bits in cheese? ›

In cheeses like Cheddars, those crunchy bits are more commonly calcium lactate. This is where lactic acid and calcium combine to form calcium lactate crystals.

Why does mac and cheese get gritty? ›

Why is my mac n cheese sauce grainy? The sauce can turn grainy if the cheese is added too quickly, the heat is too high, or if pre-shredded cheese with anti-caking agents is used. Melt cheese slowly over low heat and use freshly grated cheese.

How do you melt cheese without it getting gritty? ›

Prevent seizing with simple tricks

First, grate the cheese as finely as possible before adding it to the pan. This helps the cheese melt more quickly, allowing you to simmer the sauce at a lower heat to avoid seizing. Adding an emulsifier can also help deter problems in a sauce.

Why is my cream cheese gritty? ›

This is because ice crystals form during the freezing process. Cream cheese is approximately half water, emulsified with cheese curds. The ice crystals break down the emulsion, causing the water and cheese curds to separate, leaving a grainy, crumbly consistency once the cream cheese is thawed.

Why is extra mature cheese gritty? ›

The majority of what we find nowadays as crystals in hard cheese is amino acids (most commonly Tyrosine and sometimes Leucine) that have come about from protein breakdown. Protein is naturally found in the milk (and, therefore, the cheese).

Why is Parmesan cheese gritty? ›

These crunchy pieces are often mistaken for flakes of salt or taken as a sign that the cheese is drying out, but they are actually little bits of the amino acid tyrosine, and they appear in the cheese as a result of aging. Casein, the main protein in milk, is composed of several amino acids, including tyrosine.

How to fix grainy cottage cheese? ›

Blended Cottage Cheese 101 “Blended cottage cheese is always gritty” or “I can't get blended cottage cheese completely smooth” - As simple as it sounds - you simply need to blend it longer. 2-3 minutes should do the trick.

What enzyme is often used to coagulate cheese? ›

Calf rennet contains two main coagulation enzymes: chymosin (aka rennin) and pepsin. Calf rennet is usually ~90% chymosin and ~10% pepsin. These are both proteases that will clot milk. This mixture of enzymes is one factor that leads to the reported flavor superiority of cheese made from calf rennet.

What is a coagulant for cheese? ›

Rennet coagulation refers to the addition of enzymes to milk in order to make it clot. Many cheeses fall into this category: cheddar, gouda, queso fresco, and many others. Rennet enzymes act like a razor and shave off the κ-casein hairs.

What is the best pH for making cheese? ›

Most cheese making processes occur at a pH between 5.1 and 5.9, which is slightly acidic according to the pH scale, which ranges from 0-14.

Why does my mac and cheese feel gritty? ›

Why is my mac n cheese sauce grainy? The sauce can turn grainy if the cheese is added too quickly, the heat is too high, or if pre-shredded cheese with anti-caking agents is used. Melt cheese slowly over low heat and use freshly grated cheese.

Is grainy cream cheese safe to eat? ›

While curdled cream cheese is safe to eat, it may have a sour taste and a grainy texture. If you are using curdled cream cheese in a recipe, it may not perform as well as fresh cream cheese. For example, it may not blend as smoothly or provide the same creaminess.

What is the texture of spoiled cheese? ›

Changes in texture such as excessive softness or stickiness often indicates the presence of unusual liquid or crystals that occur when cheese has spoiled. Fresh cheese should have a firm texture without any signs of deterioration.

Why does my cheese feel dusty? ›

As cheese ages, some of the moisture moves to the surface, and the lactate moves with it. When that water ebbs, the lactate remains behind and can appear as powdery, crystal-like particles on the surface of the cheese.

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