Heat up the charcoal and wood until you have proper coals.
You want the steak to cook somewhat slowly.
Create an aluminum boat with high sides to contain the butter and enough length for the three steaks.
Melt the butter in the aluminum.
Place the steaks down into the melted butter.
Sprinkle the garlic and lemon evenly over the steaks.
Put a piece of rosemary between them.
Using a meat thermometer, watch for an interior temperature of 120 F.
Remove them from the butter.
Return the steaks to sear on the campfire for a minute or two.
You want a nice crust, but this doesn’t take long. Avoid over-cooking.
Let your steaks rest for 10 minutes.
Serve as desired.