How to Eat Politely, 1651

woodcut of two men at table

If thou soakest thy bread or meat in the sauce, soak it not againe, after that thou hast bitten it, dip therein at each time a reasonable morsell which may be eaten at one mouthfull.

Francis Hawkins, Youths Behaviour

From the same authority who told you not to be a close-talker, more timeless advice: don’t be a double-dipper.