Pre-heat oven with your cast iron pan in it at 350f.
Boil Macaroni.
In a non stick pan, saute garlic and shallot in bacon grease and butter mix.
Add diced lobster and saute for 1 min and remove.
Build your roux by adding the flour a little at a time and whisk in until all grease is absorbed.
Cook flour down for 2-3 min.
Add milk a little at a time, constantly whisking.
Whisk in cheese a handful at a time until all incorporated .
Add lobster and macaroni back in. Mix until combined.
Pour everything into your cast iron pan.
Add back to the oven for 30 min at 350f.
Remove, let cool a bit and enjoy!.