Wash the herbs in water and dry well with a towel.

Grind them using a mortar and pestle or a blender until they release their flavor.

Place them in a clean jar that is completely dry.

Add the olive oil and the salt.

Seal the jar well and store in a dark and dry place for three weeks. During that time, shake the jar once or twice.

Strain the olive oil and store in clean bottles. Discard the herbs.