Season the fish and shrimp with salt and pepper and combine with 1 oz/30 mL olive oil, Pernod, and saffron in bowl. Allow to marinate under refrigeration for 1 hour.
In a rondeau or similar pan, sweat the onions in 1 oz/30 mL olive oil until translucent, about 5 minutes. Add the garlic, leeks, and fennel and continue to sweat for 1 minute.