INGREDIENTS
12
slices Forest ham, black
1/4 cup
Spring onions
2
bunches Watercress
6 tbsp
Dijon mustard
3 tbsp
All-purpose flour
2
Kosher salt and freshly ground black pepper
1/4 tsp
Nutmeg
1/3 cup
Olive oil
3 tbsp
Red wine vinegar
3 tbsp
Butter, unsalted
3 cups
Gruyere, grated
2 cups
Milk
6
slices Pullman loaf (1/2-inch thick, lightly toasted)