Take your milk out of the cooler or trailer fridge to let warm up on the table.
Cook your pasta 1-2 minutes less than what it says on the box. Strain, put back in pot, add a little butter, mix and set aside to cool.
Melt butter in a medium saucepan over medium heat. Once it’s melted, add your flour to the butter and start whisking. Let the flour cook out for at least 3 minutes.
Slowly whisk in one cup of milk. Once thickened add in the remaining 2 cups. Keep your heat down as you do not want it to boil but instead come to a light simmer. Once thickened slowly add in handfuls of the cheese, stirring (not whisking) after each addition until all the cheese is melted in. Mix in a pinch of salt, pepper and old bay seasoning. Turn the heat off. Using your fingers (like our mother's before us) take some butter and rub it all over the bottom and insides of the cast iron pan.
Add cooked macaroni to cast iron pan.
Pour in your cheese sauce and stir to combine.
Top with bread crumbs. I grated a little extra Gouda on top.
Cover with tin foil and place right on campfire grate or barbecue over low flame or indirect heat.
Let cook for 20-30 minutes until bubbling. It should form a nice brown (not burnt) crust on the bottom. Everyone fights over these bits!