Lemon Spread--Lemon Curd? - cooking recipe

Ingredients

1/2 cup sugar
1 large egg
3 tablespoons lemon juice
2 tablespoons butter

Preparation

Beat egg well.
In small saucepan, stir together all ingredients.
Without bringing to a boil, cook over moderately low heat, stirring constantly, until mixture thickens--about 5 minutes.
Cover and chill about 1 hour.