Kabocha squash at the produce display.
Almost nobody tastes raw winter squash. You can eat zucchini raw, and plenty of people do, but the dense squashes most American cooks buy for roasting are too fibrous to eat raw in any pleasant way. So the green, gourd-like, cucumber-like flavor of raw kabocha never reaches the plate. In my squash crudo sauce I wanted exactly that flavor on top, and the squash saline is how I got it: a salted, lightly sweetened liquid pressed from raw squash trimmings that carries the raw flavor and leaves the fiber behind.
My favorite part of the finished sauce is the gourd, vegetal, green, cucumber-like character the saline gives it. In the layered flavor of the sauce, the saline is the very top: the first thing I notice after the squash itself, above the cooked squash base and the allium in the middle. The saline does two jobs at once: it carries raw squash flavor, and it salts the sauce.
Why the sauce needs raw squash
The base of the sauce is a long extraction: kabocha held in water at 180°F for a little over a day. That gives a sweet, cooked, vegetal liquid with a tea-like finish and none of the browned, burnt-sugar flavor of roasted squash. It also gives up something. To my taste, the long extraction lost the vegetable’s top notes, the fresh green character you get from cutting into raw squash. I trade those top notes for the cooked base, and the saline brings them back.
Published work on cooked pumpkin describes the same trade. In a 2026 study of three pumpkin cultivars, Xue and colleagues found that boiling, steaming and baking all lowered the green and earthy aroma compounds that sit above their odor thresholds in raw pumpkin, including hexanal, (E)-2-hexenal, (E)-2-nonenal, (E,Z)-2,6-nonadienal and 1-octen-3-ol. Steaming and boiling lowered them most. Xue’s team treated those green and earthy notes as something to cook out of pumpkin; in this sauce I want some of them back, on top of the cooked base. A second 2026 study of thirteen Cucurbita maxima pumpkins found the same contrast through a trained sensory panel: raw pumpkin smelled mainly green and cucumber-like, driven largely by alcohols, while steamed pumpkin smelled of chestnut, cream, sweetness and potato.
So the two halves of the sauce need two processes. Heat makes the base. The top note has to come from squash that never meets heat.
Where green squash flavor comes from
Much of a cucumber’s green flavor forms on the cutting board. When a blade breaks plant cells, enzymes reach the fats in the cell membranes. A lipoxygenase enzyme adds oxygen to those fats, and a second enzyme cleaves the result into short-chain aldehydes such as hexanal and (Z)-3-hexenal, part of the family of green leaf volatiles that wounded plants give off. Spyropoulou and colleagues identified the cucumber enzymes that take the next step, rearranging (Z)-3-hexenal into (E)-2-hexenal and (Z,Z)-3,6-nonadienal into (E,Z)-2,6-nonadienal, “these last two representing major flavor volatiles of cucumber fruits.”
(E,Z)-2,6-nonadienal is one of the green compounds Xue’s team measured in raw pumpkin and saw fall with cooking. Cutting makes the green notes; cooking takes them away. A liquid drawn from raw, cut squash keeps the first half of that sequence and skips the second.
The preparation
I made the saline from the squash trimmings, the pieces I did not use for the extraction, peel and seeds included. The formula was 738 g of squash, 75 g of salt, 300 g of water and 30 g of sugar. I vacuum-sealed everything in one bag on October 25 and refrigerated it until I made the sauce four days later. My goals for it were salinity, sweetness, a floral character, and above all the gourd- and cucumber-like vegetal notes of raw squash. The 30 g of sugar adds sweetness to the finished liquid, and the 300 g of water gives the trimmings enough liquid to sit in and makes the saline easy to strain and pour.
The saline preparation in its bag, labeled with its formula: squash, salt, water and sugar.
On the day of the sauce I strained the contents through a 120-micron filter bag, squeezed the solids, and collected the liquid underneath.
The salted trimmings in the filter bag: flesh, peel and seeds.
Squeezing the salted trimmings through the filter bag.
Collecting the saline beneath the filter.
The strained squash saline.
What salt and sugar do to cut squash
Salt and sugar in contact with cut squash set off an exchange. The salt and sugar dissolve in the water and in the squash’s own juices, and water and dissolved compounds move between the tissue and the surrounding liquid. Vacuum-sealing keeps that liquid in contact with every cut surface, and time in the refrigerator lets the exchange run.
The exchange runs in both directions and at different speeds for different compounds. In a study of brined cucumbers, Fasina, Fleming and Thompson tracked salt, sugars, malic acid and lactic acid over sixteen days across five cucumber sizes and found that each solute moved at its own rate, which also depended on cucumber size. That study ran far longer than my four days and used whole cucumbers, but it describes the kind of movement in play: salt moving into the tissue and the vegetable’s own sugars and acids moving out, each at its own pace.
A liquid that seasons as it flavors
Because the preparation starts with 75 g of salt, the squash saline is a seasoning liquid as much as a flavoring. Every gram of it added to the sauce adds salt along with raw squash flavor, so it did the first part of the sauce’s salting. How salty a given batch comes out depends on the squash, since the squash brings its own water to the brine, so I season with it by taste rather than by a fixed salt number.
In the sauce, I added the squash saline in four portions, 50 g, 100 g, 82 g and 53 g, 285 g in all, between rounds of acid and syrup. That used the whole batch. When it ran out, I switched to a plain 20% saline, 20 g of salt in 80 g of water, and finished the salt with 45 g of it in small steps. The plain saline adds salt alone, so the last adjustments changed the seasoning without adding more squash.
The saline went in between rounds of acid and syrup, and those three liquids work on each other. Sweetness suppresses sourness: in a study of 259 Chinese and Danish consumers, sucrose lowered the perceived sourness of citric and tartaric acid solutions. Sweetness can also lift aroma, and salt behaves differently there: Green and colleagues found that sucrose enhanced the retronasal odors they tested, while salt and citric acid did not do so consistently. So the squash saline contributes two things the syrup and acid cannot, raw squash flavor and salt, and its 30 g of sugar adds a little to the sauce’s sweetness along the way. Tasting after each saline portion, with acid and syrup moving alongside it, keeps all three in balance.
Cooked and raw together
In the finished sauce, the saline and the extraction make one squash flavor in two registers. The extraction is squash cooked: sweet, vegetal and tea-like, the base layer. The saline is squash raw: green, gourd-like and cucumber-like, the top. Together they make the sauce squash-forward from top to bottom, which is why, if anyone asked what flavor they were tasting, I would have to tell them squash.
The same contrast shows up in other vegetables. When I have extracted basil, it moved from the spicy, aromatic herb everyone knows toward something close to tea. In my experience, long heat in water takes the fresh top off a vegetable, and a raw preparation alongside the cooked one puts it back.
Method
Squash Saline
Ingredients
- 738 g raw kabocha trimmings including peel and seeds
- 75 g salt
- 300 g water
- 30 g sugar
Instructions
- Collect 738 g raw kabocha trimmings, including peel and seeds. Combine in a vacuum bag with 75 g salt, 300 g water and 30 g sugar.
- Vacuum-seal and refrigerate. I held mine for four days.
- Strain through a 120-micron filter bag and squeeze the solids to recover the liquid. Taste for salt and squash flavor.
Notes
- Collect 738 g of raw kabocha trimmings, including peel and seeds.
- Combine them in a vacuum bag with 75 g of salt, 300 g of water and 30 g of sugar.
- Vacuum-seal and refrigerate. I held mine for four days.
- Strain through a 120-micron filter bag and squeeze the solids to recover the liquid.
- Taste the saline for salt and squash flavor.
- For a 100 g batch of squash crudo sauce, add 8 g of the squash saline between rounds of acid and syrup, tasting as you go.
- Finish with 1 g of 20% saline, made from 20 g of salt and 80 g of water.
Where it sits in the sauce
The squash saline is the top layer of the squash crudo sauce. The main sauce article explains how it pairs with the cooked extraction and the other liquids: the allium essence in the middle, the orange essence in the background and the chile liquid blended through the whole.
