Mussels au Gratin | RICARDO

Ingredients

• 1 small potato, peeled and diced
• 1 stalk celery, diced
• 1/2 cup (125 ml) chicken broth
• 2 lbs (1 kg) mussels, cleaned
• 2 cloves garlic, finely chopped
• 2 tablespoons (30 ml) butter
• 4 teaspoons (20 ml) unbleached all-purpose flour
• 1 cup (250 ml) milk
• 2 tablespoons (30 ml) pesto
• 1/2 cup (125 ml) arugula, finely chopped
• Olive oil
• Salt and pepper