Manava Dharmashastra 3.244

3.244

sārvavarṇikam annādyaṃ saṃnīyāplāvya vāriṇā
samutsṛjed bhuktavatām agrato vikiran bhuvi //

Let him mix all the kinds of food together, sprinkle them with water and put them, scattering them (on Kusa grass), down on the ground in front of (his guests), when they have finished their meal.