Lacto-Fermented Turnips — Middle Eastern Torshi
Torshi is the Lebanese and broader Middle Eastern tradition of fermented vegetables — tangy, crunchy, vivid pink from raw beet. Turnips are Brassicas, sharing glucosinolate chemistry with cabbage and radishes. Fermentation transforms those glucosinolates into bioactive isothiocyanates. A 7,000-year-old food technology that also happens to be functional.
Chad Waldman
Analytical Chemist · April 19, 2026
Prep
15 min
Ferment
7–10 days
pH Target
3.4–3.8
Salt
3%
Difficulty
Beginner
Torshi is the word for “sour” across Arabic, Farsi, and Turkish. In practice it refers to the tradition of lacto-fermented vegetables — usually turnips, cauliflower, carrots, or mixed vegetables — preserved in salt brine and served as a condiment alongside mezze. The pink turnip version is the most iconic: turnips dyed magenta by raw beet slices, fermented until tangy and crunchy.
From a chemistry standpoint, turnips are Brassica rapa — the same genus as bok choy, napa cabbage, and rapeseed. Brassicas contain glucosinolates, a class of sulfur-containing secondary metabolites. When the plant tissue is disrupted — by cutting, chewing, or fermentation — glucosinolates come into contact with the enzyme myrosinase and hydrolyze into isothiocyanates. Isothiocyanates have been studied extensively for their Nrf2 pathway activation and potential chemoprotective properties.
The raw beet slice is not optional if you want authentic torshi. It is the color source. The earthy, slightly sweet undertone of beet also complements the bitter, sulfurous edge of turnip in a way that makes the whole condiment greater than the sum of its parts.
Glucosinolates and fermentation — what the chemistry does
Glucosinolates are precursors, not the active compounds themselves. They require enzymatic hydrolysis to become bioactive. In an intact, uncut turnip, glucosinolates and myrosinase are stored in separate cellular compartments. Cutting disrupts the compartmentalization and the reaction begins. Fermentation extends and modulates this process.
Lactic acid bacteria contain their own beta-glucosidases that can partially hydrolyze glucosinolates even in the absence of myrosinase. Research on fermented Brassica species has shown that LAB fermentation increases the production of bioactive isothiocyanates — notably sulforaphane from glucoraphanin — compared to spontaneous fermentation or no fermentation at all.
Raw Turnip
- Glucosinolates intact
- Limited myrosinase activation
- Lower isothiocyanate bioavailability
- Bitter, sulfurous raw flavor
Fermented Turnip (Torshi)
- LAB beta-glucosidase active
- Glucosinolates hydrolyzed to ITCs
- Higher sulforaphane and indol-3-carbinol
- Sour, complex, more palatable
Ingredients
- 1 lb turnips (peeled, cut into wedges)
- 1 small raw beet (thinly sliced (color source))
- 18g non-iodized salt (weighed)
- 600g filtered water (3% brine)
- 4–6 garlic cloves (smashed)
- 1 tsp whole black peppercorns
- Optional dried chili or bay leaf
Equipment: wide-mouth quart jar, glass weight, pH meter. Use our Brine Calculator for exact gram measurements.
How to make torshi — fermented turnips
1Cut turnips into wedges or matchsticks
Peel the turnips with a vegetable peeler — the skin is thin and not unpleasant, but peeling gives you cleaner brine and more even brine penetration. Cut into wedges (6–8 per turnip) or thick matchstick-style batons. The traditional torshi cut is wedge — it holds shape well through 7–10 days and presents beautifully in the jar. Aim for consistent size so all pieces ferment at the same rate.
Chemist's note
Turnips are a dense Brassica. Their cell walls are robust. This means they can handle a longer fermentation window (7–10 days) without losing texture — unlike watery vegetables such as zucchini. Dense cell walls also mean brine penetration is slower, which is why the fermentation window is longer than cucumber or asparagus.
2Slice one raw beet — the color source
Cut one small raw beet into 4–6 thin rounds. This is not for flavor — it is for color. The betalain pigments in raw beet leech into the brine and dye the turnips a vivid magenta-pink within 24–48 hours. This is the defining visual characteristic of torshi: the striking pink-red color that makes it unmistakable. Do not use cooked beet — the pigment behaves differently and you will get a muddy result.
Chemist's note
The beet also contributes a small amount of sugar to the brine, which accelerates early lactobacillus activity. This is a secondary benefit. The primary function is aesthetic. Lebanese home cooks have been doing this for centuries — raw beet as a natural fermentation dye. No added colorants. No food science required.
3Make a 3% brine and add aromatics
Dissolve 18 grams of non-iodized salt in 600 grams of filtered water — a 3% brine. Turnips are denser than cucumbers and require slightly higher salt to prevent off-flavors during the longer 7–10 day ferment. To the jar, add 4–6 smashed garlic cloves, 1 teaspoon whole black peppercorns, and optionally a small dried chili or a bay leaf. Then layer in the turnip wedges and beet rounds, alternating to distribute color evenly.
Chemist's note
Authentic torshi often includes a small dried chili (like Aleppo or Urfa) and sometimes a stick of cinnamon. The combination of sour, lightly spiced, and the earthy-sweetness of beet-dyed turnip is distinctive. You can keep it simple with just garlic and pepper — it will still be torshi.
4Pour brine and submerge all vegetables
Pour the 3% brine over everything until all turnip pieces and beet rounds are fully submerged with at least 1 inch of brine above the top. Turnips are dense and will not float, but beet rounds can. Use a glass weight or a small weight to keep the beet submerged. Seal loosely or use an airlock. Place the jar somewhere at 68–75°F.
Chemist's note
The brine will turn vivid pink within 24 hours. This is expected and correct. By day 3–4 it will look like magenta food coloring. The turnip flesh absorbs the color from the outside in — by day 7, cut a piece open and you will see pink all the way through. Beautiful and delicious.
5Ferment 7–10 days, taste at day 7, then refrigerate
Leave at 68–75°F for 7–10 days. Turnips take longer than most vegetables because of their dense cell structure and lower sugar content compared to cucumbers or asparagus. Taste starting at day 7. You want: pronounced sour tang, slight effervescence on the tongue, earthy-bitter turnip flavor balanced by lactic acid, and the visual payoff of the fully pink-dyed interior. pH target is 3.4–3.8. Refrigerate when satisfied. Keeps 6–8 weeks.
Chemist's note
Torshi is served alongside mezze in Lebanese cuisine — as a palate cleanser between heavy dishes. The sour, pink turnip against hummus, fattoush, and grilled meats is a textbook acid-fat-starch balance. Eat them as a condiment, not a snack. A few wedges alongside your meal is the traditional context.
The science
LAB fermentation of broccoli stalk by-product — a glucosinolate-rich Brassica tissue — significantly increased production of functional glucosinolate degradation products (sulforaphane, indol-3-carbinol, ascorbigen) by 22–33.5% compared to natural fermentation. Three screened LAB strains (Lacticaseibacillus paracasei, Pediococcus pentosaceus, Lactiplantibacillus plantarum) all demonstrated glucosinolate-hydrolyzing beta-glucosidase activity — confirming LAB as active participants in glucosinolate bioactivation across Brassica ferments including turnips.
Food Chemistry, 2025 · PMID: 39427612→
Fermentation of Thai cabbage (Brassica oleracea) by myrosinase-positive lactic acid bacteria produced significantly higher bioactive isothiocyanate content — including sulforaphane (up to 294 µmol/100g DW) and iberin — compared to spontaneous fermentation. Antioxidant activity was also significantly elevated. The LAB strains acted as alternative myrosinase sources, hydrolyzing glucosinolates even without the plant enzyme, a mechanism applicable to all Brassica ferments.
Molecules, 2018 · PMID: 29671807→
Lactic fermentation of broccoli juice by Lactiplantibacillus plantarum increased polyphenol concentration, lactic acid content, and antioxidant capacity (DPPH and ABTS radical scavenging). FTIR spectroscopy confirmed glucosinolate and isothiocyanate signatures in the fermented product. Temperature optimization (30°C) maximized bioactive compound retention — consistent with fermentation behavior in other Brassica vegetables including turnips.
Molecules, 2023 · PMID: 37375149→
Troubleshooting
Color is fading after day 5
Betalain pigments from beet are pH-sensitive. At very low pH (below 3.2) they can degrade. This is rare with a properly balanced 3% brine but possible if fermentation is very vigorous. The flavor is still correct. Aesthetic only — taste it before assuming failure.
Turnips are still crunchy at day 10
That is correct. Dense Brassica cell walls hold their structure through 10 days at 3% brine without significant softening. If you want a softer texture, slice thinner or ferment 2–3 days longer before refrigerating.
Strong sulfur smell
Brassicas produce sulfur compounds during fermentation — this is normal. A sharp sulfur note means the ferment is active. If the smell is putrid or ammonia-like rather than sulfurous-sour, that is spoilage. Normal torshi smells sulfurous, sour, and garlicky. Unpleasant in isolation; perfect as a condiment.
White residue on turnip surface
Kahm yeast. Harmless. Skim it off and ensure submersion. Common when brine concentration drops slightly from turnip moisture release.
Tools for this recipe
A jar of torshi costs less than $3 to make and keeps 6–8 weeks in the refrigerator. It is one of the most visually striking ferments you can produce at home — vivid pink turnips, sour and crunchy, next to a plate of hummus. The raw beet slice is not a trick. It is the whole point. One slice, added before the brine goes in, transforms the jar.
I'm Chad. Your chemist.