- Boil the potatoes until just tender. Drain, peel, slice, and set aside in a bowl.
- In a saucepan, melt butter and mix in flour, stirring until blended.
- Add mustard and sugar; stir.
- Slowly add the beer and Tabasco sauce. Bring the mixture to a boil, stirring constantly.
- Pour the butter mixture over the potatoes; add celery.
- Sprinkle with parsley. Toss lightly and let stand one hour before serving.