Grilled Cheesy Leek Toast | Donna Hay

Ingredients

• 30g butter
• 2 leeks, trimmed and sliced
• 30g butter, extra
• 1 tablespoon plain (all-purpose) flour
• ½ cup (125ml) milk
• ¼ cup (60ml) dark ale, such as stout
• 2 teaspoons Worcestershire sauce
• 1 teaspoon hot English mustard
• ½ cup (60g) grated cheddar
• 2 egg yolks
• sea salt and cracked black pepper
• 4 thick slices white bread