How To Can Basil Pesto Sauce

You can absolutely can basil pesto sauce at home, and it’s a fantastic way to preserve that fresh summer flavor for months.
 
Canning basil pesto sauce is a straightforward process, but it requires a few specific steps to ensure your pesto stays safe and delicious.
 
The trick is that traditional pesto is made with oil, garlic, and fresh herbs, all of which need special handling in a canning jar.
 
In this post, I’ll walk you through how to can basil pesto sauce safely, what you need to get started, and a few tips to keep that vibrant green color intact.
 
Let’s dive into the world of homemade pesto preservation.
 

Why You Can Can Basil Pesto Sauce

You can can basil pesto sauce because the combination of acid, oil, and heat creates a shelf-stable product that’s perfect for long-term storage.
 
The key is understanding that pesto is a low-acid food, so you must add lemon juice or another acid to bring the pH down to a safe level for water bath canning.
 
When you can basil pesto sauce with the right amount of acid, you’re essentially creating an environment where harmful bacteria can’t survive.
 
This method is different from simply freezing pesto, which is easier but doesn’t give you that pantry-ready convenience.
 
So, if you’re looking to make room in your freezer or just love the idea of grabbing a jar of pesto off the shelf, canning is the way to go.
 

1. The Acid Is Non-Negotiable

The very first rule when you can basil pesto sauce is to never skip the acid.
 
Lemon juice is your best friend here because it adds brightness and lowers the overall acidity of the mixture.
 
A good rule of thumb is to add about one tablespoon of bottled lemon juice per half-pint jar of pesto.
 
This isn’t just for flavor, it’s a safety measure that ensures your canned pesto is safe to eat months down the line.
 
Without the acid, you’d need a pressure canner, which changes the texture and flavor of the pesto completely.
 

2. Oil Is Your Texture Helper

When you can basil pesto sauce, the oil plays a huge role in both taste and preservation.
 
Olive oil is the classic choice, but you need to be careful about how much you use.
 
Too much oil can cause the pesto to separate during the canning process, leaving you with a weird layer of oil on top.
 
Instead, use a little less oil in the initial recipe and stir in a bit more fresh olive oil right before you serve the canned pesto.
 
This way, you get that rich, creamy texture without messing up the canning ratios.
 

3. Garlic and Herbs Need Care

Fresh garlic and basil are the stars of pesto, but they’re also the ingredients that can cause issues when you can basil pesto sauce.
 
Garlic, especially when raw, can harbor botulism spores if not properly acidified.
 
That’s why the lemon juice is so important, it neutralizes that risk.
 
As for the basil itself, you’ll want to blanch it briefly before making your pesto.
 
Blanching stops enzyme activity and helps the basil keep its bright green color instead of turning brown inside the jar.
 

Step-By-Step: How to Can Basil Pesto Sauce

Now that you know the why, let’s get into the actual process.
 
Here’s how to can basil pesto sauce from start to finish, with clear steps you can follow at home.
 

1. Blanch Your Basil First

Start by washing your basil leaves thoroughly and removing any thick stems.
 
Bring a pot of water to a rolling boil and have a bowl of ice water ready on the side.
 
Drop the basil leaves into the boiling water for about 10 to 15 seconds.
 
Immediately transfer them to the ice water using a slotted spoon.
 
This quick blanch sets the color and makes the basil easier to blend into a smooth pesto.
 

2. Blend Your Pesto Recipe

Once your basil is cooled and patted dry, add it to a food processor with garlic, pine nuts or walnuts, salt, and a splash of lemon juice.
 
Pulse everything together until you have a rough paste.
 
Then, with the processor running, slowly drizzle in olive oil just until the pesto comes together.
 
Remember, you’re using slightly less oil than you normally would, because you’ll be adding fresh oil later when serving.
 

3. Add the Extra Lemon Juice

Before you fill your jars, you need to ensure the acid level is correct.
 
For each half-pint jar, add one tablespoon of bottled lemon juice directly into the empty jar.
 
Then, spoon your prepared pesto on top of the lemon juice, leaving about 1/2 inch of headspace at the top of the jar.
 
Stir gently to mix the lemon juice into the pesto without introducing air bubbles.
 
This step is critical when you can basil pesto sauce because it distributes the acid evenly.
 

4. Seal and Process in a Water Bath

Wipe the rims of your jars with a clean, damp cloth to remove any oily residue.
 
Place the lids on and screw on the bands until they’re fingertip tight.
 
Lower the jars into a boiling water bath canner, making sure they’re covered by at least 1 to 2 inches of water.
 
Process half-pint jars for 35 minutes, and pint jars for 40 minutes, adjusting for altitude if needed.
 
Once the time is up, turn off the heat and let the jars sit in the water for another 5 minutes before removing them.
 

5. Cool and Test the Seals

Carefully lift the jars out of the water and place them on a towel-lined counter.
 
Let them cool completely, undisturbed, for 12 to 24 hours.
 
After cooling, press down on the center of each lid to check for a good seal.
 
If the lid doesn’t pop back, you’ve got a proper seal.
 
Any jars that didn’t seal should go straight into the fridge and be used within two weeks.
 

Flavor Tips for Your Canned Pesto

While the basic process is solid, there are a few tweaks you can make to elevate your canned pesto.
 
When you can basil pesto sauce, flavor can dull slightly, so you want to plan for that.
 
Add a little extra salt and a pinch of sugar to your recipe before canning.
 
The sugar balances the acidity of the lemon juice, and the salt keeps everything tasting vibrant.
 
Also, consider stirring in a bit of grated Parmesan cheese into the pesto right before you use it, not before canning.
 
Cheese can get grainy and odd after the high heat of the canner, so it’s best to add it fresh.
 

So, How to Can Basil Pesto Sauce?

You can can basil pesto sauce safely and easily by using the water bath method with added lemon juice.
 
Start by blanching your basil, then blend a pesto with slightly less oil, and pack it into jars with extra bottled lemon juice.
 
Process the jars in a boiling water bath for the recommended time, then cool and test the seals.
 
The result is a shelf-stable jar of bright, herby goodness that’s ready to toss with pasta, spread on sandwiches, or dollop into soups.
 
With a little practice, canning basil pesto sauce becomes one of your favorite summer rituals.
 
And you’ll be so glad you did when winter rolls around and you crack open that jar of summer sunshine.
 
Now you know exactly how to can basil pesto sauce, so get those jars ready and start preserving.