Separate eggs into whites and yolks.

Combine egg whites, salt, and liquid sweetener in a bowl.

Beat the egg white mixture until stiff peaks form.

In a separate bowl, combine the egg yolks, lemon juice, melted butter, flour, and skim milk.

Gently fold the egg yolk mixture into the beaten egg whites until just combined.

Pour the mixture into a quart-sized casserole dish.

Bake in a preheated oven at 350 degrees Fahrenheit (175 degrees Celsius) for 1 hour.

Allow the pudding to cool completely before serving.