Shortbread Surprise Bars

I arrived at this recipe by accident. I was trying to make a recipe that I saw on the Food Network, which had a layer of shortbread, followed by a layer of caramel, then a layer of chocloate. Unfortunately, I burned the caramel beyond redemption. As a substitute, I layered the shortbread with blackberry jam sprinkled with chopped nuts, followed by the chocolate.

Ingredients:
For shortbread:
1 stick butter cut into small cubes
1 cup flour
1/3 cup sugar
1/4 tsp salt
about 1/4 cup blackberry jam
1 tbsp lemon juice
about 1/2 cup chopped nuts (I used a combination of almonds and walnuts, but any kind will do)
10 ounces semi-sweet Baker's chocolate
1/2 cup powdered sugar

Directions:
Preheat the oven to 350 degrees.
Combine the flour sugar and salt in a food processor, and pulse once. Add the butter and pulse until the butter is just combined. Pour the mixture in a greased square baking pan, and bake for 20 minutes. Remove the shortbread from the oven and cool completely.
Melt the chocolate in a glass bowl set on top of a pot of boling water. Stir in the powdered sugar.
While the chocolate is melting, mix the blackberry jam and lemon juice together, and spread over the shortbread. Sprinkle the blackberry jam with a layer of chopped nuts.
Carefully spread the melted chocolate over the chopped nuts. Cool in the refrigerator for about 30 minutes until the chocolate hardens. Remove from the refrigerator, and cut into squares.

Source: Claire Robinson, "Millionaire's Shortbread" http://www.foodnetwork.com/recipes/claire-robinson/millionaires-shortbread-recipe/index.html