Skip to content
Salsita MX
Español Chiles
Pickles and quick-cured salsas Yucatan By Fermín Vega

Yucatan pickled red onions

Bright pink, sharp and ready in an hour. The onions on cochinita pibil, cured in sour orange rather than vinegar.

Prep
10 min
Total
10 min
Makes
about 2 cups
Difficulty
Easy
Heat No heat
Method Pickled No-cook

Kid friendly. Nothing to warn anyone about.

Ingredients

Makes about 2 cups

  • 2 large red onion sliced thin
  • ¾ cup juice orange sour orange, or the substitute below
  • 2 tsp salt
  • 1 tsp mexican oregano toasted and crumbled
  • 4 berries allspice allspice, lightly crushed
  • 1 habanero (optional) whole, unpierced
  • 2 tbsp white vinegar (optional)

Keeps 2 weeks refrigerated

Method

  1. 1

    Slice the onions as thin as you can manage — a mandoline if you have one. Thickness decides how long this takes: paper-thin is ready in 30 minutes, ⅛ inch takes two hours.

  2. 2

    Put the slices in a bowl, cover with boiling water, count to sixty, and drain. This takes the raw bite off without cooking them, and it sets the color.

  3. 3

    Toast the oregano for 20 seconds in a dry pan until it smells, then crumble it between your fingers.

  4. 4

    Combine the drained onion, orange juice, salt, oregano and crushed allspice in a glass jar. Add the vinegar if using.

  5. 5

    Drop in the whole habanero, unpierced, if you want the aroma. Do not cut it — intact it gives perfume and almost no heat.

  6. 6

    Press down so everything sits under the liquid. Leave at room temperature one hour, then refrigerate.

Good with

Cochinita pibil · Pulled pork and carnitas · Black beans · Any taco that needs cutting through

Bright magenta, sharp, and on the table with every plate of cochinita pibil in Yucatán. They are also the single fastest way to make almost any rich dish better, which is why they have spread far beyond Mexican cooking in the US.

Unlike most pickles these are ready in an hour, not days.

Sour orange is the real ingredient

Yucatecan cooking runs on naranja agria — sour orange — not on vinegar. It is a different acid: floral, bitter, less sweet than a regular orange and less sharp than a lime.

That is what gives these onions their particular flavor, and it is why a version made purely with white vinegar tastes like a generic quick pickle rather than like Yucatán.

If you cannot find it, two parts orange juice to one part lime juice plus a splash of vinegar is the accepted substitute and gets you most of the way. Bottled sour orange juice turns up in Latin markets across the US and is worth buying when you see it.

Slice thickness sets the clock

This is the only real variable.

  • Paper thin, on a mandoline: ready in 30 minutes.
  • ⅛ inch, carefully knifed: about 2 hours.
  • ¼ inch: several hours, and they never fully soften.

Thin is better here. Unlike the jalapeños, these are not meant to keep their structure for two months — they are meant to be bright and yielding.

The minute of boiling water

Pour boiling water over the sliced onions, count to sixty, drain.

This does two things. It removes the raw sulfurous bite that makes plain red onion aggressive, without cooking the slices soft. And it fixes the color — blanched onions come out a clearer, brighter pink than raw ones.

It is optional and it takes a minute. Do it.

The whole habanero

Traditional and worth including. Dropped in whole and unpierced, it gives the jar the habanero’s apricot-floral perfume and almost none of its heat, because the capsaicin sits in the veins behind intact skin.

Cut it, and you have made a hot pickle. That is a legitimate thing to make, but it is a different one.

What they are for

Cochinita pibil is the classic and the reason they exist — the acid and crunch cut straight through slow-cooked pork.

But that logic applies broadly: carnitas, pulled pork, barbecue, black beans, fatty tacos of any kind, rich sandwiches, grain bowls. Anywhere something rich needs interrupting.

Keeping them

Sealed glass jar, refrigerated, two weeks, everything under the liquid. Best in the first week, when they still have snap.

Common questions

I cannot find sour orange. What do I use?

The standard substitute is two parts orange juice to one part lime juice, plus a splash of white vinegar. Sour orange — naranja agria — is the traditional Yucatecan acid and it is genuinely different: floral and bitter rather than sweet. Latin markets in the US sometimes carry bottled sour orange juice, which is a better match than mixing your own.

Why do the onions turn such a bright pink?

The anthocyanins in red onion are pH sensitive. In their natural state they read purple; in acid they shift to bright magenta. It is the same chemistry that makes red cabbage change color. The pouring of boiling water sets it, which is why blanched onions come out brighter than raw ones.

Do I have to pour boiling water over them?

It is optional but recommended. Sixty seconds of boiling water knocks out the harsh sulfur bite of raw onion without cooking it, so the finished pickle tastes clean rather than aggressive. Skip it and you get a sharper, more assertive onion.

Is the habanero going to make these hot?

Not if you leave it whole and do not pierce it. Intact skin releases the floral aroma and only a trace of capsaicin, because the heat lives in the veins inside. This is standard Yucatecan practice. Cut it and the whole jar becomes hot.

How long do they actually keep?

Two weeks refrigerated, and they are best in the first week. The texture softens over time — after two weeks they are still good but they have lost the crunch that is half the point.