Chocolate Crackle Sauce

This is the sauce that hardens when it touches ice cream.

2 tablespoons butter
1/2 cup chopped pecans
4 (1 ounce) squares semi-sweet chocolate, chopped

Melt butter over low heat. Add chopped pecans; cook, stirring constantly, until light golden brown. Remove from heat. Add chocolate and stir until melted and smooth. Serve warm over ice cream.