This is assuming that the owner is also the chef, and exclusively concerned with cooking. Being a restaurateur is a multi-disciplinary job. The owner's job is literally to have good taste in all areas of the restaurant business: food, interior design, hospitality, branding and marketing, etc. No one is saying that they have to be a graphic designer. The obvious answer here was to have the good sense to hire a local college art student for like $300 to make an endearing and meaningful logo.