1/3 c. butter, melted
1 1/4 c. graham cracker crumbs
1/4 c. sugar
2 (8 oz.) pkg. cream cheese, softened
1 (14 oz.) can sweetened condensed milk
3 eggs
1/4 c. lemon juice concentrate
1 (8 oz.) container sour cream

Preheat oven to 300 degrees. Combine butter, crumbs and sugar; press firmly on bottom of 9 inch springform pan. In large mixer bowl, beat cheese until fluffy. Gradually beat in condensed milk until smooth. Add eggs and lemon juice; mix well. Pour into prepared pan. Bake 50-55 minutes or until set. Cool. Chill thoroughly. Spread sour cream on top.