The short answer
Start with clear origin and labelling. Then consider the grade, aroma, flavour, texture and storage. Very light colour alone is not proof of freshness.
Begin with product identity
The claim ‘Greek walnut kernels’ is useful when it comes with a specific origin and the details of the responsible business. Batch, best-before and storage information help identify and protect the product.
When buying direct, ask where the walnuts were grown and which harvest they come from.
What you can assess
A clean walnut aroma and pleasant flavour without strong rancidity are meaningful signs. Kernels should have a natural, stable texture and show no moisture or visible deterioration.
Aroma
Clean and characteristic, without a heavy rancid smell.
Flavour
Pleasant and natural, without unusual bitterness or rancidity.
Texture
Firm, without abnormal moisture or softness.
Appearance
Free from foreign matter, mould or visible spoilage.
Halves, quarters and smaller pieces
Whole halves, quarters and smaller pieces are different grades of the same kernel. The description should match what is inside the pack.
Their proportions vary from harvest to harvest, so availability can change without implying a different origin.
Colour is not the whole story
Colour is used in grading and can affect commercial classification, but should not be judged alone. Variety, ripeness, drying and storage may all influence appearance.
The clearest picture combines appearance, aroma, flavour, correct labelling and reliable origin information.
Frequently asked questions
Are very light kernels always fresher?
Not necessarily. Colour is a grading characteristic; freshness and overall quality also depend on aroma, flavour, texture, storage and batch information.
How can I recognise rancidity?
A strongly unpleasant smell or taste is a key sign. Do not eat kernels showing moisture, mould or visible spoilage.
How should opened kernels be stored?
In a clean airtight container, preferably refrigerated and protected from moisture and strong odours.