In ancient Aztec kitchens, built-in indoor herb drying racks were commonly found. These kitchens were equipped with clay pots, stone grinders, and other traditional cooking utensils. The drying racks were typically made of wood or woven fibers, and they were placed in well-ventilated areas of the kitchen. The Aztecs used a wide variety of herbs in their cuisine for flavoring and medicinal purposes, and drying them allowed for long-term preservation and easy access.