Is it better to offer few products if you are starting to sell food products?

I have heard before that it’s better to have a short menu to offer, because that way you reduce costs and can make sure that everything is in stock. I´m curious to see what others’ opinions are. In addition, if you take into account that you’re starting a business and want to see what your customers prefer, would it be worth it to offer a lot of items at the beginning to later streamline the list?