Preheat the oven to 200°C. Grease an oven-proof dish with non-stick spray.
1. Pasta: Melt the butter in a saucepan. Turn the heat down and stir in the flour. Add the milk bit by bit, while stirring continuously.
2. Stir in the cream, dried rosemary and biltong powder and simmer slowly until thickened. Season with salt and freshly ground pepper.