What is a small appetizer typically served before the main meal and often with cocktails?

The correct answer is a small appetizer typically served before the main meal and often with cocktails, which is referred to as hors d'oeuvre. These are bite-sized dishes that are designed to stimulate the appetite and can be served in a variety of styles, from cold to hot, and can be plated or passed around on trays. They are an integral part of dining culture, especially in formal settings where they enhance the overall dining experience by providing guests with a taste of what is to come.

Hors d'oeuvres can vary widely in ingredient and presentation, often reflecting the cuisine of the restaurant or the preferences of the chef. They can set the tone for the meal and are particularly common at events where cocktails are served, as they provide a perfect accompaniment and encourage socializing among guests.

The other options do not accurately describe what a small appetizer is. Gratuity refers to a tip given for service, which does not relate to the food itself. Gourmet typically refers to high-quality or specialty food but does not specifically denote an appetizer. A full-service restaurant describes the style of service and offerings of a dining establishment rather than a specific type of food. Therefore, hors d'œuvre is the term that correctly identifies this small appetizer context.