2 tbsp Dijon mustard
15驳/陆辞锄 plain flour
salt and freshly ground black pepper
pinch ground nutmeg
4 slices white bread
50驳/1戮辞锄 butter
100驳/3陆辞锄 骋谤耻测猫谤别 cheese, coarsely grated
150ml/5fl oz hot full-fat milk
4 thin slices smoked ham