The longest onion cake measured 27 m (88 ft 6 in) and was made by Hans-Dieter Slobodkin and members of the Dürrmenz-Bäcker bakery (Germany) in Mühlacker, Germany, on 6 September 2008.
The onion cake was in one piece and it took them 11 hours 45 minutes to bake the entire cake. The ingredients include the following: 34 kg (75 lb)flour, 19.5 kg (43 lb) butter, 1 kg (2.2 lb) malz, 3.2 kg (7.05 lb) salt, 0.7kg (.15lb) yeast, 17 kg (37.4 lb) water, 165 kg (364 lb) onions, 49.5 kg (109 lb) mashed potatos, 35 kg (77 lb) cream, 18 kg (40 lb) curd and 33 kg (73 lb) eggs.
Please note: Comments below may relate to previous holders of this record.