1803 in (Brit. Mus.) (1947) VIII. 232 Bill of Fare Nettle Soup Sour Crout.
1969 J. McPhee in 6 Dec. 96/2 The McNeills also collect watercress from the streams, they make nettle soup, and they eat sea kale.
1991 R. J. Pankhurst & J. M. Mullin (BNC) 56 Nettle tea..and nettle soup, were also very common.