From OpenStreetMap Wiki
|To indicate if there are special offers at lunch time|
|Used on these elements|
|Tools for this tag|
lunch:specials=* indicates if an amenity or shop=* offers special meals at lunch=*,
usually to a reduced price and not a' la carte, but just a limited choice.
The meal is often immediately available, similar to amenity=fast_food.
- If lunch is just available in a certain time range, use
- Indicate if it's also available as takeaway=*.
- For further details use the lunch=* tags.