When presented with a gift of food from his lord, he would taste it before even straightening his mat. When presented with raw meat, he would always have it cooked and then present it as an offering [to his ancestors]. When presented with livestock, he would always have it reared.
When attending his lord at a meal, he would taste the food his lord had sacrificed before giving it to him to eat.Confucius, & Slingerland, E. (2003). Analects: With selections from traditional commentaries. Hackett Publishing.
When the ruler sent him a gift of food, he would always straighten his sitting mat and first taste it. If the ruler sent a gift of uncooked meat, he would always cook it and make an offering to the ancestors. If the ruler sent a live animal, he would raise it.
If he was attending the ruler at a meal, while the ruler made an offering of a portion of the food, Confucius would first taste it.Confucius, & Watson, B. (2007). The Analects of Confucius. Columbia University Press.