Why are my hazelnuts/filberts bitter?

Why are my hazelnuts/filberts bitter? - Sliced Bitter Melon and Green Leaves on White Surface

I live in the Mid-Atlantic area and have terrible luck buying raw hazelnuts/filberts in the store. They are often bitter and/or old-tasting, very expensive, and you'd never want to eat them raw.

Last fall, my dad shared some hazelnuts a West Virginia woman gave him straight from her trees as a thank you. It was like eating a completely different nut: chewy, sweet, no aftertaste. These weren't the wild variety, sometimes called "beaked"; they looked exactly like what I buy in the store, just a little smaller. I've read that commercial "raw" hazelnuts may have to be pasteurized before sale. Could this be affecting the flavor of the store-bought nuts? Anyone got a better source than roaming the West Virginia hills (as lovely as that sounds)? My chocolate hazelnut biscotti and I thank you :)

CLARIFICATION (based on the kind and thorough replies to date): The store-bought hazelnuts are often bitter even after I remove the skins, and I'd like to avoid roasting and/or peeling. (I want to make some raw hazelnut flour for a pastry crust, for example.) I will look for the DuChilly variety, however, and welcome thoughts on other varietals. Thank you!



Best Answer

Diarylheptanoids were recently identified as responsible for bitter off-flavor in hazelnuts. This correlates with

  • infection with bugs (of the bush, not in storage) and
  • starting germination

according to: Singldinger: Molecular-sensory studies on the development of a bitter off-taste in hazelnuts, PhD thesis, 2019, Munich Technical University.

Here's also a paper: Singldinger et al.: The Cyclic Diarylheptanoid Asadanin as the Main Contributor to the Bitter Off-Taste in Hazelnuts (Corylus avellana L.), J Agric Food Chem. 2017




Pictures about "Why are my hazelnuts/filberts bitter?"

Why are my hazelnuts/filberts bitter? - Purple Abstract Painting
Why are my hazelnuts/filberts bitter? - Variety of Brown Nuts on Brown Wooden Panel High-angle Photo
Why are my hazelnuts/filberts bitter? - Woman in Purple Shirt Covering Her Face With Her Hand



Quick Answer about "Why are my hazelnuts/filberts bitter?"

The Cyclic Diarylheptanoid Asadanin as the Main Contributor to the Bitter Off-Taste in Hazelnuts (Corylus avellana L.)

Why do my hazelnuts taste bitter?

Rancidity shows in either the taste or the smell. Same thing if the hazelnut tastes unpleasant and bitter. What is this? While you won't get sick after eating a couple of rancid hazelnuts, please note that they aren't particularly healthy (HL).

Can hazelnuts be bitter?

The skin of a hazelnut is bitter, and that's why recipes like the Hazelnut Waffles call for skinning the nuts. Here are two ways to skin them yourself. (For both methods: Let the nuts cool completely before using or before storing in a sealed container in the freezer for up to three months.)

How can you tell if hazelnuts are rancid?

How to tell if unshelled hazelnuts are bad? Rancid hazelnuts will often develop a bitter, unpleasant taste; if hazelnuts develop an off odor or taste, or if mold appears, they should be discarded.

Can hazelnuts be poisonous?

When taken by mouth: Hazelnut is LIKELY SAFE for most people in food amounts. But some people are allergic to hazelnuts and have had serious allergic reactions including life-threatening breathing problems (anaphylaxis).



The Fastest and Easiest Way to Remove Skin From Hazelnuts- Kitchen Conundrums with Thomas Joseph




More answers regarding why are my hazelnuts/filberts bitter?

Answer 2

As a horticulturalist, I can tell you there are many varieties of hazelnut (also called cob or filbert). We eat ours in England without ever removing the skins, because they're mostly kentish cob nuts - these are sometimes sold 'in the green' but more usually as a mature nut. The skin may be slightly bitter, but it is not noticeable and it is not necessary to remove the skin. Other varieties have thicker skins and are more noticeably bitter, and will need the skins removed. So, in other words, when you buy your hazelnuts, it's likely you're buying a variety which has a thicker, bitter skin, whereas the ones collected from the tree in West Virginia were a different variety. One available and widely grown in parts of America which is not bitter is 'DuChilly' - it has a more elongated shape than most hazelnuts and is usually called a filbert.

Answer 3

I have fresh hazelnuts that I harvested myself a month ago and I think they are starting to turn bitter. So it might have to do with age. I'd better dehydrate these! They were all so sweet when we first picked them!

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Tamanna Rumee, Nick Collins, Marta Branco, RODNAE Productions