Tansy

Noun

1. A herbaceous plant with yellow flowers, of the genus Tanacetum, especially Tanacetum vulgare.
2. A dish common in the seventeenth century, made of eggs, sugar, rose water, cream, and the juice of herbs (including tansy), baked with butter in a shallow dish. "Originally flavoured with tansy, but by Pepys's time generally having spinach as its predominant flavouring."