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You can make walnuts less bitter by removing the tannins found mostly in the thin, papery skins that coat the nut.
Those tannins are what give raw walnuts that dry, slightly sharp taste that lingers on your tongue.
The good news is that making walnuts less bitter is simple and doesn’t require any special equipment.
In this post, we’ll look at the best ways to make walnuts less bitter, why they get bitter in the first place, and how to keep that bitterness from coming back.
Let’s get into it.
Why Walnuts Taste Bitter
Walnuts taste bitter because of tannins, which are natural compounds concentrated in the skin.
Tannins exist to protect the nut from insects and animals while it grows, but they also bind to the proteins in your saliva and create that drying, astringent feeling.
If you’ve ever bitten into a raw walnut and felt your mouth pucker, that was the tannins at work.
Freshness plays a role too.
As walnuts age, the oils inside them start to oxidize, and oxidized oils taste bitter and rancid rather than nutty.
So sometimes the bitterness you’re tasting isn’t the tannins at all, it’s simply a sign that your walnuts are old.
Knowing which one you’re dealing with helps you pick the right fix.
How to Make Walnuts Less Bitter
There are several reliable ways to make walnuts less bitter, and most of them take less than half an hour.
Here are the methods that actually work:
1. Soak Them in Water
Soaking is the most popular way to make walnuts less bitter, and it’s the method people use when they want raw walnuts that still taste fresh.
Tannins are water-soluble, which means they leach out of the skin and into the water over time.
Just place your walnuts in a bowl, cover them with cool water, and let them sit for 8 to 12 hours.
You’ll notice the water turns brown, and that’s the tannins leaving the nuts.
Drain the walnuts, rinse them well, and pat them dry before using.
2. Blanch Them Quickly
If you don’t have hours to spare, blanching is a fast way to make walnuts less bitter.
Drop the walnuts into boiling water for about one to two minutes, then transfer them straight into a bowl of ice water.
The heat pulls the tannins out of the skins quickly, and the ice bath stops the nuts from cooking further.
Once they’ve cooled, rub the walnuts between your fingers or in a clean towel to slip off the skins.
This works especially well if you’re making walnuts less bitter for baking or for a recipe where appearance matters.
3. Toast Them in the Oven
Toasting won’t remove tannins, but it does change how you perceive the bitterness.
Heat brings out the natural oils in walnuts, and those oils carry a warm, nutty flavor that masks some of the astringency.
Spread the walnuts in a single layer on a baking sheet and toast them at 350°F for about 8 to 10 minutes, stirring once halfway through.
Keep an eye on them, because walnuts go from perfectly toasted to burnt in under a minute.
Toasting also fixes the bitterness that comes from stale nuts, since the renewed aroma makes them taste fresher.
4. Boil Them in Salted Water
For anyone wondering how to make walnuts less bitter without waiting overnight, a short boil in salted water does the trick.
Add a teaspoon of salt to a pot of water, bring it to a boil, and cook the walnuts for about five minutes.
The salt helps draw out the tannins, and the boiling water carries them away.
After boiling, drain and rinse the walnuts, then spread them out to dry completely before storing or using them.
Tips to Keep Walnuts From Getting Bitter Again
Once you’ve gone through the trouble of making walnuts less bitter, you don’t want them turning bitter again a week later.
Here’s how to keep that from happening:
1. Store Them in the Fridge or Freezer
Walnuts spoil faster than most people realize because of their high oil content.
Keep shelled walnuts in an airtight container in the fridge for up to six months, or in the freezer for up to a year.
The cold slows down oxidation, which is what makes walnuts taste bitter and rancid over time.
2. Buy Them Fresh and in Small Batches
Only buy as many walnuts as you’ll use within a few months.
Buying in bulk seems like a bargain until half the bag goes stale and starts tasting bitter.
If you do buy in bulk, portion the walnuts out and freeze what you won’t use right away.
3. Taste Before You Cook
Always taste a walnut before tossing a handful into a recipe.
If it tastes sharp or bitter, you can still make walnuts less bitter by soaking or blanching them before you proceed.
Catching the bitterness early saves an entire dish from tasting off.
So, How Do You Make Walnuts Less Bitter?
You can make walnuts less bitter by soaking, blanching, or boiling them to remove the tannins in their skins.
Toasting helps too, since the nutty flavor that develops masks the astringency and revives the taste of older nuts.
After treating them, store your walnuts in the fridge or freezer so they stay sweet and fresh instead of turning bitter again.
Whether you’re baking, snacking, or adding them to a salad, a few simple steps are all it takes to make walnuts less bitter and bring out their natural, buttery flavor.