Preheat oven to 300 F.
In a large mixing bowl, beat cream cheese until fluffy.
Beat in sweetened condensed milk until smooth.
Add egg and 3 tbsp. lemon juice, mix well.
Pour ½ batter into crust.
Combine remaining 1 tsp lemon juice with preserves in a small bowl.
Spoon ½ preserves over batter.
Pour remaining batter on top.
Using a knife, swirl remaining preserves into decorative pattern.
Bake 55 minutes at 300 F.
Cool and refrigerate.