The hearty nut

Walnuts are tree nuts of the genus Juglans. Technically, they are stone fruit, not true nuts.

Once picked, walnuts need to be stored properly or they are susceptible to insect or mould infestation, producing aflatoxin (a potent carcinogen). They are best stored at low humidity, below 25°C.

The nut meat is used as a high-protein food and walnut oil as salad dressing but its low smoke point limits its use for frying.