Nasturtium Seed

Nasturtium seeds are the small, round seed pods left behind after the nasturtium plant finishes flowering. Bite into a fresh one and you get a sharp, peppery heat that's very close to the leaves and flowers of the same plant — bright, mustardy, with a horseradish-like kick that fades to a clean warmth. When they're young and green they're plump and tender; leave them on the vine and they turn firm and brownish-beige, drying down into something you can grind or store. That range in ripeness is part of the fun, because a soft green pod behaves very differently from a hardened dried one.

Most cooks first meet nasturtium seeds as a homemade stand-in for capers. Pickled in a little brine with vinegar, the green pods soften just enough and pick up a briny tang that plays off their natural pepperiness — people often call them "poor man's capers" for exactly this reason. But they're far more versatile than that one trick. You can scatter fresh pods through a salad, crush them into a dressing, or dry and grind them into a peppery seasoning that stands in for cracked pepper.

If you grow nasturtiums for the flowers, the seeds are a happy bonus you'd otherwise toss. They belong in the wider world of edible Seed ingredients and pungent spice, sitting somewhere between a peppercorn and a caper, and once you start using them it's hard to look at a bare nasturtium vine the same way again.

Spice Seed

Common uses of nasturtium seed

How do you make caper substitutes from nasturtium seeds? Pickle the young green pods in a simple brine of vinegar, salt, and a few aromatics, then let them mellow for a couple of weeks. The result is a briny, peppery bead you can use anywhere you'd reach for capers — think puttanesca, tartar sauce, or a smoked-salmon bagel.
What can you do with dried nasturtium seeds? Once the pods harden and dry on the vine, grind them into a coarse powder and use it like cracked pepper. It seasons meats, roasted vegetables, and soups with a warmth that sits close to black peppercorn but with a mustardy edge.
Can you eat nasturtium seeds raw in salads? Yes — the tender green pods add a peppery bite and a satisfying pop to leafy salads. They pair beautifully with soft lettuces, ripe tomatoes, cucumber, and anything that could use a little lift.
How do you use nasturtium seeds in dressings and vinaigrettes? Lightly crush a few pods and whisk them into an oil-and-vinegar dressing to infuse a subtle peppery heat. Leave some whole for texture and a bit of visual interest in a jar of homemade vinaigrette.
Are nasturtium seeds good on a charcuterie board? Whole pickled or fresh pods make a striking, peppery garnish alongside cured meats and cheeses, cutting through richness the way a good pickle does.
Can nasturtium seeds replace mustard or radish seeds? In a pinch, yes — they share that hot, pungent family flavor with mustard seed and radish seed, so a small amount can stand in when you want warmth without reaching for a jar of prepared condiment.
How do you add nasturtium seeds to compound butters and sauces? Finely chop pickled pods into softened butter, or fold them into a mayonnaise or cream sauce, to spread peppery flavor evenly through a dish.
What's the best way to garnish finished plates? Scatter a few whole seeds over grilled fish, roasted vegetables, or a bowl of soup right before serving for a last-second pop of pepper and color.

Health benefits of nasturtium seed

May offer natural antimicrobial properties, which have long been part of nasturtium's traditional reputation for supporting the body's defenses.
A good source of Vitamin C, an antioxidant that helps protect cells from everyday oxidative stress.
Contains glucosinolates — the same compound family found in mustard and radish — which are being studied for potential protective benefits.
Provides lutein and zeaxanthin, antioxidants associated with eye health.
Traditionally used as a gentle diuretic, which folk practice has linked to supporting kidney function.
May carry mild anti-inflammatory compounds, in line with other peppery members of the spice family.
Naturally free of gluten and suited to vegan, vegetarian, and low-carb eating, since the seeds are simply a plant pod with no additives when you pickle or dry them yourself.

Substitutes for nasturtium seed

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Storage tips for nasturtium seed

Shelf storage: Keep dried nasturtium seeds in an airtight container in a cool, dark, dry cupboard away from direct sunlight and heat. Stored this way they hold their peppery flavor for several months.
Fridge storage: Fresh green pods stay firm and lively for a week or two in a sealed container or bag in the crisper drawer; use them before they start to soften or wrinkle.
Pickled storage: Once brined, keep the jar in the refrigerator. Sealed and submerged in brine, pickled nasturtium seeds will keep for many months and often taste better after a few weeks of mellowing.
Freezer storage: Fresh pods freeze reasonably well — spread them on a tray to freeze, then bag them up. They'll lose a little crunch but keep their heat for cooking and grinding.
Watch for spoilage: Toss any seeds that smell rancid or musty, show mold, or feel slimy. In brine, cloudy liquid with an off smell or any surface film means it's time to start a fresh batch.
Keep moisture out: Moisture is the enemy of dried seeds, so make sure they're fully dry before storing and use a clean, dry spoon each time to avoid introducing damp that can lead to clumping or rot.