This is the recipe I have made for many years.

1/2 C. pearl tapioca
2 C. milk
2 eggs
1/2 c. sugar
1/4 C. milk
1 1/2 tsp. vanilla

Soak tapioca overnight.
Cook tapioca and the 2 C. milk in top of double boiler until tapioca becomes
clear.
Mix eggs and sugar together and thin with the 1/4 C. milk.
Cook till thick and add vanilla