Ingredients
- 1 1/2 Tbs. unsalted butter
- 1 1/2 Tbs. all-purpose flour
- 1 cup (240 ml) milk
- 1 cup (115 g) grated Comté or Gruyère cheese
- 1/2 cup (55 g) grated Parmigiano-Reggiano cheese
- Pinch of freshly grated nutmeg
- Pinch of ground cayenne
- Fine sea salt, to taste
- 8 slices pain de mie or other good-quality sandwich bread
- 2 Tbs. unsalted butter, melted
- 1/2 cup (125 g) whole-grain mustard
- 1 lb. (450 g) boneless picnic ham or other cured ham, thinly sliced
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