Why do we say salt and pepper not salt?

Salt and pepper is the common pairing of condiments used to season food. Salt enhances the natural flavours of food, while pepper adds a spicy contrast. Salt and pepper is a staple duo and it is more convenient to mention both at once.

Also, it is possible we got the idea to use "and" when talking about a pair from the French. The French phrase "sel et poivre," which refers to salt and pepper, dates back to the 12th century.