Katie's Southern Mac 'n Cheese Pie

Don't you want to dive into this and bathe in it?

Make it:
1 LB ELBOW MACARONI (I USE WHOLE WHEAT NOW)
1 1/2 LB EXTRA SHARD CHEDDAR CHEESE SHREDDED
1 LG ONION CHOPPED
1 LG JAR CHOPPED PIMENTO
PARSLEY 
6 EGGS
7 CUPS MILK
BUTTER
2 TBLS MUSTARD


COOK MAC IN SALTED, PEPPERED WATER W/HANDFUL OF CHOPPED ONION HALF RECOMMENDED TIME. DRAIN WELL, RETURN TO POT. ADD BUTTER, MUSTARD, PIMENTOS, REST OF ONION, PARSLEY, SALT & PEPPER & MIX. SHOULD TASTE and SMELL GOOD NOW. SET ASIDE.
BEAT EGGS & MILK, SALT & PEPPER. LAYER MACARONI MIXTURE, CHEESE, MAC, CHEESE, MAC, IN LARGE BUTTERED CASSEROLE. POUR EGG/MILK OVER TO COVER SLOWLY. IT WILL FILL ALL THE ELBOWS AS YOU PAT CASSEROLE WITH SPOON. SPRINKLE CHEESE OVER THE TOP. SPRINKLE BLACK PEPPER OVER TOP.

BAKE AT 350 DEGREES FOR APPROX 1 HR 15 MIN. STICK KNIFE IN MIDDLE TO MAKE SURE CUSTARD IS DONE. COVER WITH FOIL IF TOP BECOMES TO BROWN BEFORE CUSTARD IS DONE.
Optional: You can add basil or garlic. Change the cheese up-any kind you want. The trick is the custard. This is what no one else does.