Belgian Waterzooi (Creamy Stew)

Ingredients

• 4 skinless (boneless chicken thighs (or 500g firm white fish such as cod))
• 4 cups 1L chicken or fish stock
• 1 cup 240ml heavy cream
• 2 egg yolks
• 3 medium carrots (peeled and julienned)
• 2 leeks (white and light green parts, sliced)
• 2 celery stalks (finely sliced)
• 1 small onion (finely chopped)
• 2 medium potatoes (peeled and diced)
• 2 tablespoons unsalted butter
• 1 teaspoon salt
• ½ teaspoon white pepper
• 2 sprigs fresh thyme
• 1 bay leaf
• ½ cup 120ml dry white wine
• 1 tablespoon Dijon mustard (optional)
• ½ cup 10g fresh parsley, chopped
• Crusty bread (for serving)