Offer prasada to the guru
Appearance
Srimad-Bhagavatam
SB Canto 6
SB 6.19.24, Translation: Before taking his meal, the husband must first seat the ācārya comfortably, and, along with his relatives and friends, should control his speech and offer prasāda to the guru. Then the wife should eat the remnants of the oblation of sweet rice cooked with ghee. Eating the remnants insures a learned, devoted son and all good fortune.