Trying to duplicate something your gran used to make is a challenge. My gran made the most delicious shepherd's pie I've ever tasted, she made it with ground up left over roast beef and onion which she put through the grinder with the beef, this was mixed with the leftover gravy (she made the best gravy ever) and topped with left over mashed potatoes, waste not want not was her motto. I have duplicated this just once in all the years I've been making it, came close a couple of times but only nailed it once.
My father-in-law, used to put some really weird combos together, which we choked down and said after, that was tasty pop, fingers crossed behind our backs. But, I have to say he made a really good toasted egg sandwich.
In a frying pan he put a dab of marg, and some diced onion, when translucent he poured some egg beaten with a bit of milk over it and topped this with Parmesan cheese, pulling the sides in as it cooked instead of scrambling it turned out light and fluffy. Put between to slices of toasted bred it was really yummy.
It really picked me I couldn't quite duplicate this, I even tried it with half and half but something was missing. I finally figured what I was doing wrong, pop used canned milk not fresh, this is what made the difference.
We don't used canned milk as a rule so I buy a can and freeze it in an ice cube tray so I have it on hand when I make his sandwich, a couple of cubes melted in the microwave although not looking like it does coming out of the can does the trick.
Annette