Here is a decent video on making ghee:
https://www.youtube.com/watch?v=asLxQ0q2Z3w
A couple of important points, from the video & my own experience:
- use unsalted butter
- use a pot with a light bottom
- do not ‘stir’ - use something like a flat spatula to gently move foam aside to check on the bottom of the pan ... see when milk solids are settling out & keep an eye on their color
- I strain through a cloth in a wire a strainer which definitely catches everything & results in a very clear ghee - a beautiful gold color is perfect - it will solidify as it cools
- every time you get ghee out of the jar, use a clean, dry spoon
Fortunately I don’t have lactose intellerance issues. Three of my grandparents came from dairy raising farm holdings. Just before the recent major snow and ice storm, I went out and bought 2 gallons of milk for myself. A nice 8 day supply.