Yes, cashews in their raw, unprocessed form are kosher as they are a product of nature. However, processing methods and additives can affect their kosher status. For instance, if a cashew product is processed on equipment that also processes non-kosher foods, it may no longer be considered kosher. The same applies if any non-kosher additives or flavorings are added to the cashews. Always look for a kosher certification on the packaging if kosher foods are required for your diet.