You don't say in your request but most people make lemon meringue pie with a cornstarch thickened filling, and cornstarch can be tricky. Here's a different lemon meringue pie that everyone raves about and it never fails:

1 can sweetened condensed milk
1/2 cup lemon juice
grated rind of 1 lemon
2 egg yolks
==mix together and pour into crust (graham cracker crust is nice)
Use the two egg whites for your meringue, sweetened with 2-3 Tbsp sugar. Bake at 325 for 15 min or until lightly browned.