To start the Gourmets Gone Missing side adventure in The Legend of Zelda: Tears of the Kingdom, speak with Penn at the Riverside Stable during the Potential Princess Sightings side adventure.
For this quest, speak with Gotter in the goat pen farthest from Penn to learn more about the recipe. Afterwards, head in the direction he showed you, which is to the south over the Owlan Bridge. Once you cross the bridge, continue following the main road.
Eventually you’ll find some tents.
Speak with the people there then put Raw Meat, Hylian Rice and Rock Salt into the pot. This will create the Meat and Rice Bowl. Once you craft this recipe, hand the dish to Agus who is leaning against the tree complaining of pain. Afterwards, the quest will complete! As a reward, you’ll receive the ingredients back.