Savory
A herb with small, narrow leaves, peppery, sharp and thyme-like; in Georgian cooking, where it is called kondari, it is one of the most important herbs.
Dried savory is found in well-stocked supermarkets or spice shops and online, fresh savory occasionally at farmers' markets or as a potted plant; Georgian recipes usually mean summer savory, which is milder than winter savory.
Substitute:
Thyme with a little marjoram comes closest, though it lacks the slightly peppery bite that sets savory apart from both.