1. Heat oil in a small skillet over medium heat. Add onion and garlic and sauté until lightly browned. Reduce heat, add spinach and cook briefly until just wilted.
2. Divide spinach mixture among 4 fish fillets and spread evenly over each. Season with salt (in moderation). Roll up and place in a lightly oiled baking pan, seam side down. Sprinkle each roll with paprika and parsley.
3. Bake at 375oF for 15-20 minutes or until fish is opaque and flakes easily.
4. In a small skillet, whisk together flour and half-and-half. Heat over medium heat and continue whisking until mixture thickens. Stir in green onion and tarragon and season with pepper to taste. Pour sauce over baked fish fillets.
Per Serving: 160 calories, 5g fat, 1g saturated fat, 55mg cholesterol, 145mg sodium, 6g carbohydrate, 0g fiber, 22g protein