Related על ביצה 2:8

The members of the house of Rabban Gamliel's used to ground pepper in their mill. R. Elazar ben Zadok said: Once my father came to dine at Rabban Gamliel’s house. So, they put fish broth and vinegar broth in front of him, with pepper ground onto it. Then my father pulled his hands away. Rabban Gamliel said to him: Don't worry about him; it was ground up the day before the holiday.