Can I drink coffee at a restaurant?
It is not possible to make one universal statement about the kashrus of coffee prepared in a non-certified restaurant because each establishment is unique. Investigation has shown that theoretically, coffee served in a restaurant may be kosher even if the equipment used to prepare the coffee is washed in a sink together with other non-kosher items. However, there are numerous variables which impact the halachic status, such as the introduction of soap, the temperature of the water, the method of washing (kli rishon versus kli shaini) etc. Due to the uncertainty and ambiguity of each situation, as a general rule, the OU does not recommend the consumption of coffee prepared in a non-kosher restaurant.
