Combine Oils
Pour the melted refined coconut oil and the very cold liquid oil into a tall container. Use an immersion blender to blend the two oils together until they are thoroughly combined.

Emulsify
Add the cold plant-based milk to the oil mixture. Continue blending with the immersion blender until the mixture emulsifies and reaches a thick, mayonnaise-like consistency.

Season
Add the ½ teaspoon of sea salt (or a big pinch) at the end and blend briefly once more to incorporate.

Set and Chill
Pour the mixture into an airtight container. Refrigerate for at least a couple of hours until it solidifies into a spreadable butter.