Turmeric, a rhizome that looks a bit like ginger. It dyes everything it touches that amazing colour and has medicinal properties. In India they make a poultice of it to put on wounds to help them heal and my GP says it works but he doesn't know why. It contains curcumin, which I believe helps prevent Alzheimers. In fact I take the powder every morning in orange juice, so let's see how I get on!