Final answer:
Options for substituting a side in a restaurant vary based on the establishment's policy; basic substitutes are usually free, while premium sides may incur a charge.
Step-by-step explanation:
When a guest in a restaurant wants to substitute a side, the options available for substitution and whether there is a charge will depend on the restaurant's policy. Typically, restaurants have a set menu with specified side options that come with main dishes at no extra charge. When substitutions are allowed, common complimentary substitutions might include different types of vegetables, salads, or starches like rice or potatoes. However, if the guest requests a more premium side, such as a salad with special ingredients or a side that is more costly for the restaurant to prepare, there may be an additional charge. The best way to determine what can be substituted and whether there will be an additional cost is to ask the server or refer to the menu, where such details are often outlined. The ability to substitute a side dish and whether there is a charge for it can vary depending on the restaurant's policies. Generally, restaurants that allow substitutions may offer options for sides that are of similar value or cost. Some restaurants may allow substitutions without an additional charge within certain limits, while others may charge extra for premium or upgraded side options. To know the specific substitution policy of a particular restaurant, it's best to check the menu or inquire with the server. Many restaurants include information about substitutions, additional charges, or customization options on their menus or in their policies.