Gourmets are cave goblins you can sell food to in the Dorgesh-Kaan market trading minigame. You should speak to Lurgon to get permission to sell food. He will send you to a random council member that will give you permission. Once you have permission, you can sell food to the gourmets.
The player should use any type of food on Lurgon to find out a selling price. Use the price Lurgon gives you as a guide. Generally, if the gourmet has a neutral response, sell the food for around the price Lurgon gave you. If it's a negative response, try lower, and if it's a positive response, you can try higher. The same gourmet won't buy food from the player twice in a row.