Simply whisk or blend these two ingredients together until well mixed and no lumps (from the coconut milk) remain.
If your can of coconut milk is very cold, you may want to whisk these in a small pot over low/medium heat so they will mix well.
Store in an airtight container in the refrigerator for up to two weeks. It would probably last longer, but that’s generally how long mine will last me until I’ve used it all.
The mixture will settle some as it sits, so give it a shake the next day before you use it.