Praline and Kahlua Brownies

Source: Junior League Centennial Cookbook

Praline Crust
1/3 cup light brown sugar, firmly packed
5 1/3 tablespoons butter
2/3 cup all-purpose flour
1/2 cup pecans, finely chopped

Brownie Filling
2 ounces unsweetened baking chocolate (2 squares)
1/4 cup solid vegetable shortening
4 tablespoons butter
1/4 cup granulated sugar
1/2 cup light brown sugar, firmly packed
1 teaspoon vanilla extract
2 large eggs
1/4 cup Kahl