In saucepan, melt butter and cho. over low heat. Add sugar, Half-and-Half and salt. Bring to a boil, cook over med. heat at a slow rolling boil, stirring constantly for 5 mins. until thickened. Cover and refrigerate until needed. When ready, heat choc. sauce in micorwave 20-230 seconds. Add liqueur and stir to combine thoroughly. Serve immediately with fruit and cake. For Two: Pour one cup warm Choc. Sauce into dessert fondue pot and place over burner. On a dinnner plate, attractively arrange pound cake cubes, bananas, fresh fruit, and marshmallows. Serve with 2 fondue forks and 2 dessert plates.