It is common to have a sore throat following the procedure, but this is most likely due to the endotracheal tube that is used during surgery to keep your airway open and to help you breathe. You may experience mild soreness that may cause discomfort, especially while swallowing. In this case, you may want to choose soft foods like mashed potatoes, soups, smoothies, and yogurts at first. Cold foods like ice cream can also be soothing. The soreness from the tube should subside in a few days.
Please note that everyone recovers from surgery differently. Some people are able to eat a cheeseburger and fries after a thyroidectomy with no problem, while others may struggle with pasta. It really does vary from person to person, but barring any complications, you should be back to a normal diet relatively within 72 hours of surgery. Keep in mind that chewing more completely and drinking fluids often during meals will also help.