Wash the basil really well under cold running water. Allow it to air-dry. Spin it in a salad spinner to remove as much moisture as possible. Then lay it flat on a clean towel to finish drying.
Preheat the oven to 200℉. Line a sheet pan with parchment paper.
Place basil in a food processor and process until finely chopped. Add the salt and quickly process to combine.
Lay basil salt on the prepared sheet pan and spread it into a thin layer. Place it in the oven. Bake for 2 hours
Remove from the oven and allow to cool. Pack into a jar that seals tightly.