Your restaurant general manager cover letter must demonstrate a clear understanding of the food service industry's dynamics. Learn how you can write a restaurant manager cover letter that is professionally structured and contains all the information hiring managers are looking for.Stepbystep guide to writing a restaurant manager cover letter. Includes a free template. A restaurant manager needs to prove value in the first paragraph. So start your cover letter strong with a tantalizing fact. The purpose of a cover letter is to make a compelling case for yourself as a candidate for a particular job, and it complements what's in your resume.