CAKE:

1 pkg. Pillsbury Plus Butter Recipe Cake mix
2 tbsp. lime juice plus water to equal 1 c.
1/2 c. butter, soft
3 eggs

FILLING:

1 (14 oz.) can sweetened condensed milk (not evaporated)
1/2 c. lime juice (key lime if you can find it)
2 c. whipping cream

Oven to 350 degrees. Grease and flour 2 (8 inch) round cake pans. Combine all cake ingredients at low speed until moist. Beat 2 minutes on high. Pour into pans. Bake 30 to 40 minutes. Cool 15 minutes. Remove from pans. Cool completely.

Combine sweetened condensed milk and 1/2 cup lime juice, mix well. Beat whipping cream until stiff peaks form. Reserve 1 cup of cream. Fold condensed milk mixture into whipped cream just until blended. Slice each cake layer in half horizontally to make 4 layers. Spread 1 cake layer with 1/8 of whipping cream mixture, repeat. Top with remaining cake layer. Pipe in decorative pattern or spread unused whipped cream over top. Refrigerate 2 to 3 hours. Garnish with lime slices. Store in refrigerator. Serve 12.