You can also set the chefs cooking style to careful.
Check the difficulty level of the dishes on your menu and lower them if needed. If the food is consistently burnt the chef may be out of their depth. Wait time to be seated is also hugely important so make sure you use the disallow new customers function of the host station to keep footfall under control throughout the day if necessary. Also, remember that a chef has to cook a dish for everyone so while the waiter may be fine with four tables of two and three Sims, the chef may not. If they are unskilled they may need to drop down to three. Make sure that your wait staff have only four tables at most. This can be an issue with the wait staff or the chef so check to see which is overwhelmed.
Here are the most common issues and how to solve them: Paying attention to these will increase your rating. Some you'll notice from watching your staff and others you'll see at the end of the day when you are given some growth opportunities. There are a lot of common problems that will crop up each day.
