The walnut is native to SE Europe and West & Central Asia but is now grown in the UK, California and China as well. High in fat, they go rancid very quickly and should be stored in the fridge or freezer.
Analysis for whole (per 28g or 14 halves)) 190 calories, 4g protein, 18g fat
Analysis for pieces (per 100g 654 calories, 65g fat, 0mg cholesterol, 2mg sodium, 14g carbohydrates, 7g fibre, 3g sugar, 15g protein.
Storage: 3 months in fridge; 6 months in freezer