1845 E. Acton i. 25 (heading) Parsnip Soup. Dissolve..four ounces and a half of good butter..and slice in directly two pounds of sweet tender parsnips.
1975 17 May 10/8 A bowl of parsnip soup—‘so thick you could trot a mouse on it’, as the country saying goes.
2003 (Nexis) 16 Mar. (Mag.) 51 An espresso cup full of a powerful, creamy parsnip soup.