Looking for more aromatic satisfaction?! Have some of this.
The unripe fruits operate the border between flavoring and vegetable. They have an intoxicatingly delicious aroma which is perfect for infusing into syrup, vinegar, alcohol, honey, sugar or salt. It is a flavor you will want to carry with you into the winter. In Italy, unripe walnuts are used to make a black colored drink called Nocino (not-chee-no). They can also be used to make pickled black walnuts. As the fruits get larger, they quickly become unsuitable for pickling and must then be used as a flavoring ingredient.
To test them for pickling, carefully push a sharp knife or steel skewer through the fruit. You should not hit any resistance. If you do hit resistance then the walnut shell has started to form and the fruit will be too poorly textured to give a good result. Use tough fruits for flavoring or to make Nocino.