Asparagus Croque Monsieurs | RICARDO

Ingredients

• 2 tablespoons (30 ml) butter
• 2 tablespoons (30 ml) flour
• 1 cup (250 ml) milk
• 1/4 cup (60 ml) grated Gruyère cheese
• 1 pinch nutmeg
• 1 1/2 lb (675 g) asparagus, trimmed
• 2 tablespoons (30 ml) olive oil
• 4 slices prosciutto
• 4 large slices country-style bread (same length as asparagus spears)
• Whole-grain mustard to taste
• 4 large slices Gruyère cheese
• Salt and pepper