The Mustard Trick Is Real. Your Jar Of Dijon Was Never Tested.

You buy broccoli because you've heard it's good for you. Fair enough. But the way most of us cook it can throw away the part you paid for.

Boil it, and a key enzyme dies in the pot. Frozen broccoli lost that enzyme at the factory, long before it reached you.

And the fix you keep seeing online is a spoonful of mustard. So I went to find out if that holds up…

In 2013, at Reading University, in England, food scientist Sameer Ghawi and his team boiled broccoli and measured what was left. Boiled broccoli made almost none of the compound people buy it for.

Then they sprinkled mustard powder on it. Mustard is a cousin, with a tougher form of the same enzyme. The compound came back.

In 2018, the same group tested it in 12 adults. With mustard on their cooked broccoli, they took in more than four times as much.

So the trick is real. Here's the bowl it belongs in, and then the part the headlines left out…

How The Enzyme Unlocks The Good Part

Broccoli and its kin store a raw material. Call it the raw stuff from here on.

In the same plant sits an enzyme. Think of it as a key. The two are kept apart in the cell until you chop, crush or chew the leaf.

When they meet, the key turns the raw stuff into sulforaphane. That's the compound labs study because it turns on enzymes that help the body clear out harmful stuff. Call it the compound.

Here's the catch. Heat wrecks the key. Mustard seed carries a hardier one, so add it after you cook and the job gets done.

The Part Nobody Has Tested

Now the honest bit. Every one of those studies used mustard seed, ground to a powder. Not one used a jar of Dijon.

I couldn't find one test of jarred mustard. It's mixed with vinegar or wine and sits on shelves for months, so it may or may not hold a live key. Nobody has measured it, as far as I can tell.

And here's the twist. In this bowl, nothing is cooked. Raw kale and raw sprouts carry their own key, so they don't need the mustard's help. The Dijon is there for taste; the powder is your insurance for cooked greens.

Massaging the kale is the same story. Rubbing breaks the cells open, so the key can start work. That's a sound guess, and I found no study of massaged kale at all.

Why The Sprouts Do The Heavy Lifting

In 1997, Jed Fahey, Yuesheng Zhang and Paul Talalay at Johns Hopkins measured sprouts. Three-day-old broccoli sprouts held 10 to 100 times more of the raw stuff than the grown plants.

You'll often see that quoted as "20 to 50 times." The paper says 10 to 100, depending on the seed.

Is there proof in people? Some. In 2014, a team including Johns Hopkins scientists gave 291 adults in Qidong, China, a sprout drink or a fake one for 12 weeks. The sprout group passed 61 percent more benzene, a pollutant, in their urine, and 23 percent more of another, acrolein.

That was a sprout extract, not a salad. And it measured pollutants leaving the body, not disease. Hold it at that.

One more thing. The Food and Drug Administration says older adults, pregnant women, young children and anyone with a weak immune system should skip raw sprouts. Warm, damp sprouting suits germs like Salmonella. If that's you, cook the sprouts briefly, then add mustard powder off the heat.

Raw, Steamed, Boiled Or Frozen

In 2008, Dutch researchers led by Martijn Vermeulen fed eight men 200 grams of crushed broccoli, raw and cooked. Their bodies took in 37 percent of what the raw kind offered, and 3.4 percent from the cooked.

In 2002, researchers at Spain's national research council tried four ways to cook broccoli. Plain boiling lost 55 percent of the raw stuff, most of it to the water. The microwave, their way, lost 74 percent. Steaming barely touched it.

Shop frozen broccoli has its own problem: factories blanch it in hot water first. In 2013, Edward Dosz and Elizabeth Jeffery at the University of Illinois found store-bought frozen broccoli made almost none of the compound once cooked…

Their fix was a little raw daikon radish, a cousin with a hardy key, and it put some of it back. At home, mustard powder is the easy version.

Reheating? I found no study on leftovers. But a dead key stays dead, so add mustard when you serve, not while you cook.

Why The Rest Of The Bowl Earns Its Place

Broccoli has long been called the king of the cabbage clan, and kale is one of its oldest members.

Its dark leaves carry lutein and beta-carotene, which your body takes up better with fat. In a 2005 trial led by Nuray Unlu, adding 150 grams of avocado to a salad raised lutein absorption about five times and beta-carotene about 15 times. I couldn't confirm who funded it.

The olive oil adds more fat. Quinoa, Harvard's Nutrition Source notes, is one of the few plants with all nine amino acids, at about 8 grams of protein per cooked cup.

The lemon is for taste. I found no study asking more of it. Salmon just makes it dinner.

Three Things Worth Knowing

Sameer Ghawi and colleagues went looking for a way to rescue boiled broccoli. What they found was already sitting in the spice rack.

The mustard trick works. Just know which mustard was tested, and that a raw bowl like this one barely needs it.

Make the bowl this week. Then put the mustard powder by the stove and use it.

Stay well,
The Healing Plate