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.
Water amaranth or sessile joyweed. A type of amaranth which grows vigorously, providing nutritious greens. Use only tender new shoots as old leaves can leave a bitter taste in the mouth.
Cubeb pepper. Resembling large, hollow green peppercorns. Like peppercorns they should be ground before use. They can be used as a substitute for peppercorns, but have a more bitter flavour.