What is this green salsa/hot sauce called, and how do I make it at home?

Thinking about moving to a place with less Mexican options and would love to be able to make this at home.

Serrano level heat, maybe cream or avocado for the color?

Edit – Thanks everyone!! Looks like I need to give it a shot with my stick blender, but probably need a proper blender to get it this smooth. I will start with veg/avocado oil and see how it goes. Pure oil emulsion explains the richness that comes with the heat.