Mix graham cracker crumbs with melted butter.
Add sugar and stir until combined.
Press mixture into your pie pan firmly.
Make sure the bottom is even.
Push crumbs up the sides too.
Refrigerate while making the filling.
Whisk together sweetened condensed milk and yolks.
Add fresh lemon juice slowly.
Stir in lemon zest and salt.
Mix until the filling is smooth.
The mixture will thicken slightly.
Pour lemon filling into the chilled crust.
Spread it evenly with a spatula.
Cover the pie with plastic wrap.
Refrigerate for at least 4 hours.
Overnight is even better for firmness.
Beat heavy cream until soft peaks form.
Add powdered sugar and continue beating.
Spread or pipe onto chilled pie.
Garnish with fresh lemon slices if desired.