Lemon Blackberry Cake - cooking recipe

Ingredients

1 (18 1/4 ounce) box lemon cake mix
1 (3 1/2 ounce) box instant lemon pudding
1 1/4 cups water
3 eggs
1/3 cup vegetable oil
1 tablespoon lemon juice, I used concentrate
2/3 - 1 cup blackberry jam (for 8 \" or 9 inches layer cake)
2 (1 lb) cans lemon frosting
1 pint fresh blackberries, for garnish (optional)

Preparation

Bake cake according to directions on box making an 8 or 9\" layer cake, adding the dry lemon pudding mix and lemon juice.
Cool 10 minutes.
Invert cakes from pans onto rack to cool.
Spread each top (which is actually the flat bottom sides)with blackberry jam while cake is still hot. Use 1/3-1/2 cup per cake.
Let cool completely.
Place one cake onto platter, (jam side up),spread top carefully with frosting over jam.
Top with second cake. (Jam side up.).
Frost top and sides completely, or do a lattice top and decorate, also frosting sides, though.