How To Make Walnut Flour

You can make walnut flour at home by grinding shelled walnuts into a fine powder.
 
It’s a simple process that takes just a few minutes and requires only a blender or food processor.
 
Whether you’re baking gluten-free treats or thickening soups and sauces, homemade walnut flour is a nutritious and versatile ingredient worth keeping in your pantry.
 
In this post, we’ll walk through how to make walnut flour step by step, the best equipment to use, and tips to keep it fresh.
 
Let’s dive in.
 

How to Make Walnut Flour Step by Step

Making walnut flour is straightforward, but a few key steps ensure the best texture and flavor.
 
Here’s exactly how to make walnut flour at home:
 

1. Start With Raw, Shelled Walnuts

The quality of your walnut flour depends on the quality of your walnuts.
 
Use raw, unsalted walnut halves or pieces that are fresh and free of any moldy smell.
 
Avoid roasted or flavored walnuts since they can alter the taste of your walnut flour.
 
If your walnuts taste bitter, they’re rancid, so toss them and start with a fresh batch.
 

2. Toast Them Lightly for Better Flavor

Toasting is optional, but it deepens the nutty taste of your walnut flour.
 
Spread the walnuts on a baking sheet and toast at 350°F for about 5–7 minutes.
 
Stir once halfway through so they toast evenly and don’t burn.
 
Let them cool completely before grinding, because warm walnuts release oils that can turn your walnut flour into a paste.
 

3. Grind in Short Pulses

Add the cooled walnuts to a food processor or high-speed blender.
 
Pulse in short bursts of 2–3 seconds rather than running it continuously.
 
This prevents the walnuts from releasing too much oil and clumping into walnut butter.
 
Scrape down the sides between pulses to keep the grind even.
 

4. Sift for a Finer Texture

Once you have a coarse meal, sift it through a fine mesh sieve.
 
The fine powder that falls through is your finished walnut flour.
 
Return any larger pieces to the processor and pulse again.
 
Sifting gives you a lighter walnut flour that blends smoothly into baked goods and coatings.
 

5. Store It Properly

Walnut flour goes rancid quickly because of its high oil content.
 
Keep it in an airtight jar or freezer bag in the fridge for up to a month.
 
For longer storage, freeze your walnut flour for up to six months.
 
Label the container with the date so you always know how fresh your walnut flour is.
 

Best Equipment for Making Walnut Flour

The right tools make a big difference when you make walnut flour.
 
Here’s what works best:
 

1. Food Processor

A food processor gives you the most control for making walnut flour.
 
Its wide bowl and sharp blade let you pulse evenly without overheating the nuts.
 
This is the top choice for anyone making walnut flour in larger batches.
 

2. High-Speed Blender

A high-speed blender works too, but it’s easier to overshoot and end up with walnut butter.
 
Use the lowest speed and pulse carefully if this is your only option for walnut flour.
 

3. Coffee Grinder for Small Batches

A clean coffee grinder is perfect for small amounts of walnut flour.
 
Grind in tiny batches and sift often to avoid oily clumps.
 

Common Mistakes to Avoid When Making Walnut Flour

Even simple recipes can go wrong, so watch out for these pitfalls.
 

1. Over-Processing the Walnuts

The biggest mistake is blending too long.
 
Walnuts turn into a sticky paste fast, and once that happens, you can’t go back to walnut flour.
 
Pulse, check, and pulse again.
 

2. Using Old or Rancid Walnuts

Rancid walnuts ruin the taste of your walnut flour.
 
Always smell your walnuts before grinding, and buy from a store with a good turnover rate.
 

3. Skipping the Cooling Step

If you toast your walnuts, let them cool fully before grinding.
 
Warm nuts release oil faster, which means your walnut flour could turn greasy.
 

4. Storing at Room Temperature

Never leave walnut flour in your pantry for weeks.
 
The oils go bad quickly, so refrigerate or freeze your walnut flour every time.
 

So, How Do You Make Walnut Flour?

You make walnut flour by grinding raw or lightly toasted shelled walnuts in short pulses, then sifting for a fine texture.
 
It’s an easy DIY project that gives you a gluten-free, nutrient-rich flour for baking, breading, and thickening.
 
Just remember to use fresh walnuts, avoid over-processing, and store your walnut flour in the fridge or freezer.
 
With these steps, you’ll always have homemade walnut flour ready whenever a recipe calls for it.