Senfeier - cooking recipe

Ingredients

4 tablespoons butter (1/2 stick) or 4 tablespoons margarine (1/2 stick)
1/4 cup flour
2 2 cups water or 2 cups stock
1/4 cup prepared brown mustard
1 teaspoon salt
1 teaspoon sugar
2 -4 tablespoons vinegar, to taste
4 eggs

Preparation

Melt the butter in a small saucepan. Add the flour and whisk until absorbed and pasty taste has cooked out, about 3 minutes.
Add liquid, mustard, salt, sugar and vinegar and whisk until smooth. Bring to a boil and cook until thick, about 3 minutes.
Reduce heat to a simmer and add eggs, one at a time. Poach gently until eggs are soft-set, 3-4 minutes. Serve over boiled potatoes (or, if you're Sam, over toast).