Salmon, Rice, and Leek Soup - Lidia

Ingredients

• 1/4 cup extra-virgin olive oil
• 2 tablespoons unsalted butter
• 3 leeks, white and light-green parts, thickly sliced
• 2 stalks celery, chopped
• Kosher salt
• 1 cup Arborio or other short-grain Italian rice
• 1 1/2 cups frozen peas, thawed
• 1 pound skinless salmon fillets, cut into 1-inch chunks
• 4 scallions, chopped
• Freshly ground black pepper, for serving