Sauteed Cod with Asparagus, Asparagus Veloute

I discovered this recipe from Rozanne Gold's Healthy 1-2-3 cook book. This is a nutritional cookbook that utilizes only three ingredients per recipe. I like this book because the recipes are fat-free, low fat or low calories.

Ingredients:
2 pounds asparagus
4 tablespoons unsalted butter
6 7ounce cod fillets

Directions:
1. Cut asparagus off top 2 1/2 inches of asparagus stalks and set aside. Peel asparagus stalks. Cut stalks into 1 inch pieces. Cook stalks in large saucepan of boiling slightly salted water until very tender, about 10 minutes. Using slotted spoon, transfer stalks to blender. Add 3/4 cup cooking liquid to blender. Blend until very smooth, adding more cooking liquid to thin sauce. Blend 2 tablespoons butter into sauce. Season with salt and pepper.
2. Cook asparagus tips in boiling salted water until crisp-tender, about 4 minutes. Drain
3. Sprinkle fish with salt and pepper. Melt 2 tablespoons butter in each of 2 heavy large skillets over medium-high heat. Add 3 fish fillets to each skillet and cook until golden and opaque in center, about 4 minutes per side. Spoon warm sauce onto plates. Top with fish. Garnish with asparagus tips and serve.