This low sodium sauerkraut delivers the same tangy, crisp, probiotic-rich character of traditional fermented cabbage, but with a fraction of the salt. By using a modest 1% salt brine and adding a splash of whey or a starter culture, you get a safe, reliable ferment that stays crunchy and pleasantly sour—perfect for anyone watching their sodium intake without giving up flavor.
Ingredients
- 1 medium head green cabbage (about 2 lb / 900 g)
- 1 tbsp (18 g) fine sea salt (non-iodized)
- 1 cup (240 ml) filtered or unchlorinated water
- 2 tbsp (30 ml) whey (from plain yogurt or kefir) or 1 packet sauerkraut starter culture (optional but recommended)
- 1 tsp (5 g) caraway seeds (optional)
Instructions
- Remove any wilted outer leaves from the cabbage. Quarter it and cut out the core. Shred the cabbage thinly, about 1/8-inch thick, using a knife or mandoline.
- In a large bowl, toss the shredded cabbage with the salt. Massage the cabbage with your hands for 3–5 minutes until it becomes wet and reduces in volume by about half. The salt will draw out liquid.
- If using whey or starter culture, stir it into the cabbage mixture along with the caraway seeds, if using.
- Pack the cabbage tightly into a clean 1-quart (1-liter) glass jar, pressing down firmly with a spoon or your fist to eliminate air pockets. Pour any accumulated liquid from the bowl over the cabbage.
- Mix the filtered water with 1 teaspoon (5 g) of the remaining salt (from the 1 tbsp total) to make a 1% brine. Pour this brine over the cabbage until it is completely submerged. Leave at least 1 inch (2.5 cm) of headspace.
- To keep the cabbage submerged, place a small glass weight or a clean, food-safe plastic bag filled with a little brine on top. Alternatively, use a cabbage leaf folded over the surface and tuck it under the rim.
- Cover the jar with a lid (loosely) or a cloth secured with a rubber band. Place the jar in a cool, dark place, ideally 65–70°F (18–21°C). Ferment for 5–7 days, checking daily to ensure the cabbage stays submerged. You may see bubbles and a slightly sour smell—that’s normal.
- After 5 days, taste the sauerkraut. If you prefer it more sour, let it ferment for up to 2 more days. Once it reaches your desired tang, seal the jar tightly and refrigerate.
Tips
- Use non-iodized salt: Iodized salt can inhibit fermentation and cause bitterness. Fine sea salt or kosher salt without anti-caking agents works best.
- Keep it submerged: Any cabbage exposed to air can develop mold. Use a glass weight or a plastic bag filled with brine to keep everything below the liquid line.
- Watch the temperature: Fermentation slows below 60°F (15°C) and can become mushy above 75°F (24°C). A cool basement or pantry is ideal.
- Don’t skip the starter: With only 1% salt, the fermentation is slower and less protective. Adding whey or a starter culture introduces beneficial bacteria that outcompete unwanted microbes, making the ferment safer and more consistent.
Serving Suggestions
Serve this sauerkraut as a tangy side to grilled sausages, pork chops, or roasted chicken. It also shines on a Reuben sandwich, mixed into a grain bowl, or as a topping for avocado toast. For a simple snack, toss it with a little olive oil and black pepper.
Variations
- Spiced: Add 1 teaspoon of mustard seeds, 1/2 teaspoon of juniper berries, or a pinch of red pepper flakes along with the caraway.
- Apple-fennel: Shred 1 small apple and 1/2 fennel bulb with the cabbage for a sweeter, anise-flavored kraut.
- Beet and ginger: Grate 1 small beet and 1 tablespoon of fresh ginger into the cabbage for a vibrant pink, earthy version.
- No-starter method: If you omit the whey or starter, increase the salt to 1.5 tablespoons (27 g) and use a 2% brine (2 teaspoons salt per cup of water) to ensure safety. The flavor will be slightly saltier but still lower than traditional sauerkraut.
Storage and Reheating
Refrigerate the finished sauerkraut in a tightly sealed jar. It will keep for up to 2 months, though the flavor will continue to develop and become more sour over time. Always use a clean fork to remove portions to avoid introducing bacteria. Do not heat sauerkraut if you want to preserve the probiotics; if you prefer it warm, heat gently over low heat just until warmed through—do not boil. For longer storage, you can freeze it in small portions for up to 6 months, but the texture will soften and the probiotics will be lost.
Frequently Asked Questions
Why is my sauerkraut mushy? Mushy sauerkraut usually comes from fermenting at too high a temperature (above 75°F/24°C), using old or soft cabbage, or not keeping the cabbage submerged. Use fresh, firm cabbage and keep the jar in a cooler spot.
Is it safe to eat if there’s white film on top? A thin white film (kahm yeast) is harmless but can taste slightly yeasty. Skim it off and discard. If you see fuzzy mold (green, black, or pink), discard the entire batch—do not eat it.
Can I use iodized table salt? It’s best to avoid iodized salt because it can inhibit fermentation and cause off-flavors. Use non-iodized sea salt or kosher salt. If you must use table salt, reduce the amount by 20% because it is denser.
How do I know when it’s done? Taste it after 5 days. It should be pleasantly sour and slightly fizzy, with a firm crunch. If it’s still too salty or not sour enough, let it ferment a few more days. Once it’s to your liking, refrigerate to slow the process.
Why did my jar overflow? Fermentation produces gas and liquid, which can push brine out. Place the jar on a plate to catch spills, and leave headspace. If it overflows, just wipe the rim and re-seal.
Can I use a different vegetable? Yes, you can replace up to half the cabbage with shredded carrots, turnips, or radishes. They add color and different textures, but keep the total weight the same and adjust salt accordingly.
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