Uncle Don's favorite lemon pie

Why I Love This Recipe
My great aunt was a wonderful baker, and this was her late son's favorite lemon pie. It reminds me of years of holiday potlucks at his house. I have made small changes to it to suit my taste, but I think he would still love it.
Ingredients You'll Need
9” graham cracker pie crust
1/2 c + 1T cornstarch
2 c sugar
4 c milk
5 egg yolks
7 T meyer lemon juice
zest from one lemon
Heavy whipping cream
Powdered sugar for whipping cream (sweeten to taste)
Directions
Make slurry by combining some milk and cornstarch together first or the cornstarch will be a lot harder to get smooth
In a large saucepan, combine sugar, egg yolks, milk, and cornstarch slurry
Heat gradually up to medium heat, until mixture is thick and bubbly
Remove from heat, and add juice and zest
Pour into graham cracker crust. Cool completely before serving,
Serve with generous dollop of whipped cream