Nigella. The small, black, bitter seeds of a relative of "love-in-a-mist". Nigella is often incorrectly called wild onion seed or black onion seed. The seeds have a sharp, pungent flavour with a hint of a smell of strawberries and are used for flavouring confectionary and liquors.
Peanut oil (US: groundnut oil). Oil extracted from peanuts. It has a high melting point and smoke point and is ideal for deep frying. It has 20% saturated, 30% polyunsaturated and 50% monounsaturated fat.
Indian spinach. This is most likely to be Basella alba, a tropical climbing plant that can grow as high as 2 meters (6 ft), the leaves being harvested as the plant grows and cooked in the same way as spinach or stewed in oil with spices. It is a type of amaranth, which includes many varieties of a sweetish green leafy vegetable known by many different names, including callalloo, elephant’s ear, African/Ceylon/Chinese/Indian spinach, Surinam amaranth, etc.
Black peppercorns, the fruit of a perennial vine with large leaves and white flowers. Green peppercorns are the unripe fruits picked early and pickled. Black peppercorns are picked just before they ripen and white peppercorns are the ripe, black peppercorns with the black skin flaked off. They are best kept whole and ground when required. Historically, pepper was one of the world's most important spices. Columbus sailed West, not East, in search of pepper in the East Indies. Instead he found the Americas and allspice.