Salt consists of 2 ingredients which by themselves are poison but together they are beneficial & it serves to preserve & enhance the food.
Thus it serves as a symbol of two people waiting for each other thinking are we going to join together in a positive way to perform mitzvos & share Torah or not. We need to learn from Hashems salt to always bring some taam (good flavor ) to the table.
Now may be a good time for a gem of Torah study.