Lacto-Fermented Tomato & Pepper Salsa

Davis Whitehead·72 hr 20 min·Makes about 1 L (about 16 servings of 60 g)

A bright, tangy, naturally fermented salsa built from peak tomatoes and sweet/hot peppers. You’ll salt the chopped veg, pack it under its own brine, and let lactic fermentation do the work—no vinegar or citrus needed. Ferment it chunky for a cleaner, crunchier ferment, then blend after it’s pleasantly sour to dial in your ideal texture. Great with tacos, eggs, grilled meats, or as a spoonable condiment all week.

  • fermented
  • salsa
  • no-cook
  • meal prep
  • condiment
72 hr 20 min total · 20 min prep · 72 hr rest
20 kcal · 1g protein · 4g carbs · 0g fat total
Digital scale · 1 L wide-mouth jar · Fermentation weight (or small zip-top bag + 2% saline)

Ingredients

  • Ferment Base
  • •800 g field tomatoes (about 5–6 medium), cored and 1–2 cm diced
  • •150 g peppers (a mix of Jimmy Nardello, Hungarian hot wax, Escamillo), stemmed and finely chopped
  • •120 g yellow onion (about 1 small), finely chopped
  • •10 g garlic (about 2 cloves), finely grated or minced
  • •20 g kosher salt (about 1 Tbsp Diamond Crystal; ~2% of veg weight—see note)
  • Optional (but helpful)
  • •50 g green cabbage, very finely shredded (helps kickstart fermentation)
  • •20 g cilantro, finely chopped (stir in after ferment for freshest flavor)
  • If needed to top up brine
  • •200 g water + 4 g kosher salt (2% saline; use only if veggies aren’t fully submerged)

Instructions

Prep & pack (15–20 minutes)

1

Weigh your chopped vegetables (tomatoes, peppers, onion, garlic, and cabbage if using) in a bowl. Note the total weight.

2

Salt at ~2% by weight: multiply the veg weight by 0.02 to get salt grams. (Example: 1,000 g veg → 20 g salt.) Toss very well.

3

Let the mixture sit 10–15 minutes. You should see liquid pooling; the tomatoes will start to sweat.

4

Pack the salsa into a very clean jar, pressing firmly to remove air pockets. Pour in any liquid from the bowl.

5

Add a fermentation weight (or a small zip-top bag filled with 2% saline) so the solids stay fully submerged. Leave 2–3 cm headspace.

Ferment (2–5 days)

6

Set the jar on a plate (in case it bubbles over) and ferment at 20–22°C out of direct sun.

7

Burp daily (briefly open the lid) if using a standard jar. Keep everything submerged; if needed, top up with 2% saline.

8

Start tasting at 48 hours. It’s ready when it smells clean and pleasantly sour, tastes tangy with a little tingle of carbonation, and the flavors have rounded out.

Blend AFTER ferment (important)

9

Ferment it chunky, then blend after it’s tangy enough. Chunky fermentation stays crisper and makes it easier to keep the ferment clean and fully submerged.

10

Once ready, remove the weight and pulse-blend to your preferred texture (or leave it chunky). Stir in cilantro now if using.

Refrigerate

11

Transfer to the fridge to slow fermentation. Flavor will keep developing (more sour) over time.

Tip: If you want thicker salsa, drain off a little brine before blending; save it to splash into soups, marinades, or to loosen the salsa later.

Notes

Heat control: keep hot wax peppers for punch; use more Jimmy Nardello for sweetness. Safety: use clean tools, keep solids submerged, and discard if you smell anything rotten, see fuzzy mold, or the brine turns slimy. Storage: refrigerated, it typically keeps 1–3 months (often longer) as long as it stays clean; it will slowly become more sour. Substitutions: if you don’t have cabbage, skip it; fermentation may start a little slower. If tomatoes are very sweet and you want extra zing, ferment a day longer rather than adding citrus.

More recipes

  • White Bean, Tuna & Herb Salad (Lemony, Peppery)
  • Umami-Boosted Caramelized Onions (Miso–Soy Finish)
  • Instant Pot Pork Carnitas (1 lb Pork Stew Meat)
  • Lacto-Fermented Kohlrabi Pickle with Fennel Seed, Dill & Chili
  • Classic Chicken Sausage, Cabbage & Apple Skillet
  • No-Blender Sesame Ginger Rice Vinegar Dressing