What's in Italian Seasoning, and Why Does Oregano Lead?

Italian seasoning tastes of oregano whatever its label order says, because oregano is the herb best equipped to survive drying. Basil and parsley reach the jar with almost nothing left, which is why fresh basil at the end of a cook is not optional.

What is on the label, and what do you taste?

A jar of Italian seasoning usually lists five or six dried herbs, and the order they appear in has very little to do with the order you taste them.

Drying is what breaks the connection. Some of these herbs keep almost everything that made them smell like themselves, and some arrive at the jar as green confetti.

That table answers the most common complaint about the blend, because dried oregano dominates simply by being the herb best equipped to survive drying.

Dried basil is the clearest casualty. The compounds behind its sweet, faintly aniseed character are among the most fragile in any common herb, and what survives is closer to hay than to the plant.

None of that makes the blend a bad product. It makes it an oregano-led product, which is a useful thing to know before blaming the brand.

Dried parsley is in the jar for color and bulk rather than for taste, and a blend that leans on it is padding the volume.

An American blend with an Italian name

No Italian cook reaches for a jar of this. The blend is an American convenience product, and Italian cooking works the other way round, choosing one herb for one dish.

Basil belongs with tomato and with very little else.

Oregano goes on pizza and into southern sauces, and rosemary goes on roast potatoes and lamb.

Putting all of them in one jar is a shortcut rather than a tradition, and shortcuts are allowed.

What the shortcut costs is precision. A dish that wanted only oregano now also carries rosemary, and rosemary is the one herb in the mixture with the power to redirect a sauce.

The name does one genuinely useful thing, which is to tell a cook what register the food is aiming at. A pan carrying the blend will read as broadly Mediterranean even when no single herb in it is identifiable.

Dried marjoram is the ingredient that varies most between brands, and it is also the one a reader is least likely to notice going missing.

Why do two jars season a pan differently?

Two jars with identical ingredient lists can season a pan very differently, and the reason is physical rather than botanical.

Dried rosemary comes as needles that can be ten times the size of a thyme leaf. A level teaspoon of a coarse blend therefore holds far fewer rosemary pieces than the same spoon of a finely rubbed one, and the ratio you measured is not the ratio you get.

• Grind changes the ratioA coarse blend under-delivers the big-leafed herbs and a fine one over-delivers them, which is why the same teaspoon behaves differently between brands.
• Crush it on the way inRubbing the blend between your palms breaks leaf surfaces and releases far more aroma than dropping it in whole, and it costs nothing.
• Settling separates the jarThe heaviest fragments sink, so the last spoonful from an uncrushed jar is not the same mixture as the first. Shake before measuring.
• Stems are fillerLong woody fragments weigh something and taste of nothing, and a jar that rattles is mostly stalk.

Whether the herbs were rubbed or left whole matters more here than in most blends, because the leaf sizes in the mixture are so unequal to begin with.

None of this is a reason to buy a particular grind. It is a reason to shake the jar and crush the spoonful, both of which are free.

When does it go in, and how much?

Woody leaves go in early, and they want fat or liquid to open up in.

Thirty seconds in warm oil before the tomatoes arrive does more for the blend than any amount of it added at the end.

A teaspoon per pound or per tin is a reliable starting point because nothing in the blend is aggressive except rosemary.

The exception is a long cook. Two hours of simmering brings rosemary steadily forward while the softer herbs fade, so a sauce that tasted balanced at twenty minutes can taste piney at the end of the afternoon.

Fresh basil at the finish is the repair for everything the drying took away. It is a different ingredient rather than a stronger version of the dried leaf, and adding it late is the usual rule for delicate herbs rather than a trick specific to this blend.

Where does the blend help, and where does it blur?

The blend earns its place where a dish wants a general Mediterranean background rather than a particular herb.

The test is whether you could name the herb the dish is supposed to taste of. If you can, the blend is the wrong tool, because it will supply that herb along with four others.

Dried thyme on its own is the most frequent improvement on the jar, since it does most of what people want from Italian seasoning in a roast without bringing rosemary along.

Mixing a batch that fixes the oregano problem

Making your own is worth the ten minutes for one reason, which is that you get to decide how much rosemary is in it.

1. Start from oreganoTwo tablespoons of dried oregano is the base, because it will lead the blend whatever else goes in. Fighting that is how commercial jars end up tasting muddy.
2. Build the savory middleOne tablespoon each of dried thyme and dried marjoram. Marjoram is what keeps the mixture from reading as pizza topping alone.
3. Add rosemary last and sparinglyTwo teaspoons, crushed small before it goes in. This is the ingredient to reduce if a previous batch took over your sauces.
4. Decide about basil honestlyOne tablespoon if you want the color and the faint sweetness, none if you plan to finish dishes with fresh leaves anyway.
5. Crush, then rest a dayRub the finished mixture between your palms and leave it closed overnight so the aromas settle into one another rather than sitting in layers.

Leaving parsley out entirely is the other easy improvement, because its job in a commercial jar is visual.

Dried garlic and onion powder appear in some supermarket versions and turn the blend into something closer to a seasoning salt. They are not wrong, and they make the jar less useful in a dish that already has fresh garlic in it.

Home-dried leaves are usually greener and more fragile than commercial ones, so a batch made from them wants a slightly lighter hand than the same volume from a jar.

Whole dried leaves keep better than rubbed ones, so a jar mixed from coarse herbs and crushed at the moment of use stays good considerably longer.

When there is no blend and no time to mix one, dried oregano on its own covers most of the ground, since it is what the jar mostly tastes of anyway.

Adding dried basil to that gets the label closer and the taste no nearer. A pinch of dried thyme is the addition that changes something, because thyme survives drying and supplies the savory line that oregano lacks on its own.

A blend built for another cuisine is the swap to avoid, since herbes de Provence brings rosemary where the dish wanted oregano and a taco blend brings cumin, which redirects the food rather than seasoning it.

Telling a live jar from a dead one

Nothing in the jar spoils in a way you can see. The herbs fade instead, and a faded blend looks exactly like a fresh one.

Color is the least reliable signal of the three available. Gray-green is normal for properly dried Mediterranean herbs, and a uniform bright green often means the color was protected at the expense of the aroma.

Most jars are past their useful life at around a year, and a jar kept above the stove gets there faster because heat and steam reach it every time something cooks.

The general keeping rules for dried leaves apply without modification, which is a closed container, a dark cupboard, and distance from the hob.

Replacing a jar is cheap, and using a dead one is the expensive option. A sauce made with spent herbs needs more of everything else to compensate, and it still will not taste of oregano.