INGREDIENTS
3 tbsp
unsalted butter
4
yellow onions, sliced
1 tbsp
white wine vinegar
1 tsp
fresh thyme
3
lbs red potatoes, washed and cubed
1 tbsp
Maille Dijon Mustard with Horseradish
salt and pepper
1/4 cup
unsalted butter
3/4 cup
half and half, warmed