tansy

noun

1. 1.A herbaceous plant with yellow flowers, of the genus Tanacetum, especially Tanacetum vulgare.
2. 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."