Ingredients

9″ Pastry Pie Shell, baked
1/3 Cup Cornstarch
1 1/2 Cups White Sugar
1/4 Tsp Salt
1 1/2 Cups Water
3 Eggs, separated
2 Tbs Butter
1 Tsp Lemon Zest, optional
1/2 Cup Lemon Juice
1/2 Tsp Cream of Tartar
5 Tbs Powdered Sugar

Steps

Blend cornstarch, white sugar, and salt in a pot.
Stir in water until dissolved.
Cook over medium heat until thick and clear (10 minutes), [...]