Fermented Cherry Tomatoes with Fresh Basil 🍅🌿

If you have a garden overflowing with cherry tomatoes, fermentation is a wonderful way to preserve them while giving them a delicious tangy, savory flavor. These fermented cherry tomatoes with basil stay juicy and develop a naturally bright, slightly sour flavor that is wonderful on salads, sandwiches, pasta, eggs, grilled meats, or simply eaten straight from the jar.

Unlike traditional pickling, this recipe relies on natural lactic-acid fermentation rather than vinegar. The result is fresh-tasting, flavorful tomatoes with a pleasantly tangy bite.

🛒 Ingredients

2 pounds (900 g) fresh cherry or grape tomatoes
4–5 fresh basil leaves, or more to taste
1 liter (4¼ cups) filtered or non-chlorinated water
20 g (about 1 tablespoon) non-iodized salt
2–3 cloves garlic, lightly crushed — optional
½ teaspoon black peppercorns — optional
½ teaspoon red pepper flakes — optional

Important: Salt Ratio

For a reliable fermentation, use approximately 2% salt by weight of the water:

20 g salt per 1 liter of water.

If making a smaller amount, keep the same ratio rather than simply guessing the salt.

🫙 Equipment

1 large clean fermentation jar, approximately 1½–2 quarts
Small fermentation weight or another food-safe method for keeping the tomatoes submerged
Clean spoon
Loose-fitting lid or fermentation lid

👩‍🍳 How to Make Fermented Cherry Tomatoes

1. Prepare the tomatoes

Wash the cherry tomatoes well and remove any stems.

Choose tomatoes that are firm and free from mold, bruises, or signs of spoilage.

For better fermentation, gently pierce each tomato once or twice with a clean toothpick or skewer. This allows the brine to penetrate more easily and helps prevent tomatoes from floating with trapped air inside.

2. Prepare the jar

Wash your fermentation jar and equipment thoroughly.

Place a few basil leaves in the bottom of the jar. Add garlic, peppercorns, or red pepper flakes if using.

3. Pack the tomatoes

Add the cherry tomatoes to the jar, layering them with the remaining basil leaves.

Don’t crush or pack the tomatoes so tightly that they split.

Leave several centimeters of space at the top of the jar.

4. Make the salt brine

Dissolve 20 g of non-iodized salt in 1 liter of filtered or non-chlorinated water.

Stir until the salt is completely dissolved.

Pour the brine over the tomatoes until they are completely covered.

5. Keep everything submerged

This is one of the most important steps.

Place a fermentation weight on top of the tomatoes to keep them under the brine. Any tomato or basil exposed to air is much more likely to develop mold.

If necessary, add a little more 2% brine to keep everything submerged.

6. Cover the jar

Cover the jar with a fermentation lid or a lid that allows gas to escape.

Do not tightly seal a jar of actively fermenting tomatoes. Fermentation produces carbon dioxide, which needs somewhere to go.

Place the jar somewhere out of direct sunlight at cool room temperature.

⏰ How Long Should They Ferment?

The exact time depends on temperature and how sour you like your tomatoes.

Start checking them after about 3 days.

3 days: Mildly tangy and fresh
4–5 days: More noticeable sourness and deeper flavor
6–7 days: Stronger fermented flavor

Once they taste the way you like, transfer the jar to the refrigerator.

The cold temperature slows fermentation considerably.

❄️ How to Store Them

Once fermentation reaches your preferred flavor, keep the tomatoes refrigerated and submerged in their brine.

Always use a clean utensil when removing tomatoes from the jar.

If you notice fuzzy mold, unusual colors, a rotten smell, or other obvious signs of spoilage, don’t taste them—discard the batch.

🍅 How to Eat Fermented Cherry Tomatoes

These little tomatoes are incredibly versatile.

Try them:

On avocado toast
With scrambled or fried eggs
In green salads
With pasta
Alongside grilled chicken or fish
On sandwiches and wraps
With cheese and crackers
Chopped into salsa
Over rice or grain bowls
Mixed into potato salad
Straight from the refrigerator as a tangy snack

And don’t throw away the flavorful brine! A little can be used to add a salty, tangy punch to dressings, marinades, or sauces.

🌿 Why Add Basil?

Fresh basil gives the tomatoes a beautiful herbal aroma while they ferment. As the tomatoes sit in the brine, the basil’s flavor slowly infuses the liquid and tomatoes.

You can also experiment with other herbs such as dill, oregano, thyme, or rosemary.

For a spicy version, add a sliced chili pepper or a pinch of red pepper flakes.

🌟 Tips for the Best Fermented Tomatoes

Use fresh tomatoes. Firm cherry tomatoes hold their shape better than very soft, overripe ones.

Don’t skimp on the salt. The salt concentration is an important part of creating a successful vegetable fermentation.

Keep the tomatoes submerged. This is probably the most important practical tip.

Use non-chlorinated water. Chlorine can interfere with the microorganisms responsible for fermentation. Filtered water is a simple choice.

Expect bubbling. Small bubbles, cloudiness in the brine, and a pleasantly sour aroma can all occur during active fermentation.

Taste with a clean utensil. Avoid repeatedly putting used utensils into the jar.

Refrigerate when they’re ready. You don’t have to wait a full week if you already love the flavor after a few days.

🍅 A Delicious Way to Preserve Tomato Season

When cherry tomatoes are coming out of the garden faster than you can eat them, fermentation gives you another option besides freezing, drying, or making sauce.

The tomatoes remain juicy and bright, while the basil adds a fresh herbal note and the natural fermentation gives everything a delicious tang.

A jar of fermented cherry tomatoes is one of those simple homemade foods that gets better the longer you learn how to make it. 🌿🍅

Quick Recipe Card

Prep: 15 minutes
Fermentation: 3–7 days
Storage: Refrigerate after desired sourness is reached

Ingredients: 2 lb cherry tomatoes, 4–5 basil leaves, 1 L water, 20 g non-iodized salt, plus optional garlic and spices.

Method: Pack tomatoes and basil into a clean jar → cover completely with 2% salt brine → keep submerged → ferment at room temperature for 3–7 days → refrigerate when the desired flavor is reached.