1. In a saucepan, put together 1/2 cup water and soup mix; stir to mix and let stand for 5 minutes until soup mix is softened.
2. Add beans, beef, and relish; stir well.
3. Cook on medium heat until mixture is heated through; occasionally stir.
4. In a plate, place toasted buns and spoon beans mixture over it.
5. Serve immediately.