Green Peppercorns vs. Capers: How Do They Compare?

Green peppercorns and capers sit side by side in jars of brine, and in a sauce they look alike, but they come from unrelated plants and bite for different reasons. Green peppercorns are unripe berries of the black pepper vine, Piper nigrum, and their heat comes from piperine. Capers are the unopened flower buds of the caper bush, Capparis spinosa, and their pungency comes from a mustard oil.¹ That difference decides when one can stand in for the other: rinsed capers can mimic green peppercorns’ soft, briny pops in a pâté, but in a cream sauce for steak, where the pepper is the whole point, reach for cracked black pepper instead.

Side by side

	Green peppercorns	Capers
Plant	Piper nigrum, the same vine as black and white pepper	Capparis spinosa, the caper bush
Family	Piperaceae	Capparaceae
Native range	Western Ghats of Kerala, India, per Kew’s species profile; Kew’s distribution data list only Sri Lanka (see black pepper)²	Mediterranean to Mongolia and the Indian subcontinent, and the Philippines to the western and southern Pacific
Part used	Green (unripe) berries	Flower buds, picked just before they open
Size	About 2.0 to 6.0 mm across, whole, under Codex³	Smallest grades (nonpareilles, surfines) under 1 cm; larger capucines and communes over 1.5 cm¹
How they are kept	Dried under controlled conditions, or preserved in brine; one processor’s bulk brine is 17% ± 2% salt³⁴	Never dried; pickled in oil, brine or vinegar, or less often packed in coarse salt that must be rinsed off¹
Pungent compound	Piperine, the main source of pepper’s flavor	Glucocapparin, a mustard oil glycoside that releases methyl isothiocyanate¹
Other notable compounds	Codex sets no piperine minimum for green pepper, though it does for black and white³	Bitter flavonoid glycosides; rutin is the most important flavonoid¹
Flavor, as sources describe it	Fresh ones give “a sharp, herbal heat” (Suwanee);⁵ Katzer rates green pepper the least pungent of the three peppers⁶	Pickled capers smell spicy and a little sour, and taste slightly astringent and pungent (Katzer)¹
Flavor	Bright, green, gently hot	Briny, tart, sharp, faintly floral
Main uses	Thai jungle curry; cream and pan sauces	Mediterranean, especially Italian cooking: tomato or wine sauces, poultry, fish, cold meats, vitello tonnato
Price	No dated, sourced comparison found	No dated, sourced comparison found

The flavor row isn’t sourced, so take it as a rough guide. For the pepper in depth, see green peppercorns.

The differences that change a dish

Two kinds of bite

Pepper’s characteristic flavor comes mainly from piperine, the compound black, white and green pepper share. Capers have none of it. Their sharpness comes from glucocapparin, which breaks down enzymatically to methyl isothiocyanate, a mustard oil.¹ So capers give a mustardy, sour edge, and green peppercorns give pepper heat. Neither can stand in for the other’s kind of bite.

We didn’t find anyone who’s measured green peppercorn heat well. Katzer says pungency is strongest in white pepper and weakest in green,⁶ and Codex sets piperine minimums for black and white pepper but none for green.³ We found no study that measures piperine in green peppercorns.

Cooking time

Katzer says to add capers to a sauce as late as possible, when it’s only lukewarm. He notes that caper berries, the fruit of the same shrub, handle boiling much better than the buds.¹ In other words, treat the buds as a finishing ingredient. Green peppercorns often get simmered in cream sauces, but we found no source measuring how their flavor holds up to cooking.

Salt and brine

Both arrive salty. In one Kerala Agricultural University process, green peppercorns are stored in a 17% ± 2% salt solution.⁴ Salt-packed capers have to be rinsed before use.¹ You can rinse brined green peppercorns too if you want to control the salt yourself.

Size and look

They look most alike at the small end. Codex puts whole green pepper at about 2.0 to 6.0 mm,³ and the smallest caper grades are under 1 cm. Bigger capers, over 1.5 cm, dwarf any peppercorn. Katzer notes that the white spots you often see on pickled capers are said to be rutin.¹

One vine, three peppers

Green, black and white pepper are the same berry, handled differently. Codex defines green pepper as green berries with moisture removed under controlled conditions, black as dried berries with the outer layer unbroken, and white as dried berries with that layer removed.³ The McCormick Science Institute sums it up: depending on harvest time and processing, peppercorns can be black, white, green or red.⁷ See white pepper vs. black pepper.

Can one stand in for the other?

They overlap on brine, softness and size, but not on flavor.

Capers in place of green peppercorns. Our green peppercorn substitutes page picks rinsed capers as the stand-in for the soft, briny pops of green peppercorns in pâtés, terrines and butters. Ratio (Method): Start with an equal amount, chopped if the capers are bigger than peppercorns, and add a little cracked black pepper for the heat capers lack. In a cream sauce for steak, the pepper is the whole point, so cracked black pepper is the better swap there.
Green peppercorns in place of capers. You get the brine and the soft texture, but pepper heat where you wanted a mustardy sourness. Ratio (Method): Start with about half as many drained green peppercorns as the capers called for, since they add heat capers don’t, then taste. A splash of vinegar or lemon juice can bring back some of the tartness. In a dish where capers lead, like a tomato or wine sauce, it’ll taste noticeably different.

What isn’t known

We found no study measuring the piperine content of green peppercorns, and Codex sets no minimum.³
None of the sources we opened says how bitter fresh caper buds are or how much brining cuts the bitterness, though Katzer reports bitter flavonoid glycosides in capers.¹
We found no dated, sourced price comparison.

Green peppercorns and green peppercorn substitutes
Black pepper, black pepper substitutes, white peppercorns
Pink pepper, which is not a pepper either
Peppercorn medley vs. black pepper
Too much pepper? How to fix the dish.

Gernot Katzer, “Caper (Capparis spinosa)”, Gernot Katzer’s Spice Pages. gernot-katzers-spice-pages.com · Reference work ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹
Piper nigrum L., Plants of the World Online and Kew Species Profiles, Royal Botanic Gardens, Kew. powo.science.kew.org · Reference work ↩
Standard for Black, White and Green Peppers, CXS 326-2017, Codex Alimentarius. fao.org · Standard ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷
Pepper (Piper nigrum): Processing and Value Addition, Kerala Agricultural University. celkau.in · Reference work ↩ ↩²
Suwanee, Jungle curry (gaeng pa), Simply Suwanee. simplysuwanee.com · Publication ↩
Gernot Katzer, “Black Pepper (Piper nigrum)”, Gernot Katzer’s Spice Pages. gernot-katzers-spice-pages.com · Reference work ↩ ↩²
“Black Pepper”, McCormick Science Institute. mccormickscienceinstitute.com · Reference work ↩

Also drawn on

Black pepper (Britannica Editors, revised by Sohini Dasgupta, updated 11 Sep 2026), Encyclopaedia Britannica. britannica.com
Caper (Britannica Editors, revised by Melissa Petruzzello, updated 20 Aug 2026), Encyclopaedia Britannica. britannica.com
Capparis spinosa L., Plants of the World Online, Royal Botanic Gardens, Kew. powo.science.kew.org

Green Peppercorns vs. Capers: Two Brined Bites From Unrelated Plants