Paraskaragrihyasutra 2.17.8

2.17.8

yatra śrapayiṣyannupalipta uddhatāvokṣite 'gnimupasamādhāya tanmiśrairdarbhaiḥ stīrtvā ' 'jyabhāgāviṣṭvā ' 'jyāhutīrjuhoti \8\

Where he intends to cook (the sacrificial food), he establishes the fire on a place that has been smeared (with cowdung), which is elevated, and which has been sprinkled (with water), strews (round the fire) Darbha grass mixed with (stalks of) that (sort of corn to which the sacrifice refers), sacrifices the two Âgya portions and Âgya oblations (with the following Mantras):