He explained that later in the year when it is in season, he will return to pick the yellow gorse flowers (which have a distinct coconut taste) to use in meat marinades and Thai curries, as well as burdock root, which is popular in Japanese cooking and can be used for vegetable soups or mixed with dandelion to make a root beer-like soft drink.

BBC: The wild taste of Wales

Fatty acid content in vegetable oils can vary significantly, a spokeswoman for Spruce Naturals says, depending on factors such as differences in climate, soil, seed variety and how the oil is pressed.

WSJ: An Oil's Promises, From Cooking to Cosmetics