1. Puree avocado, milk, lime juice, garlic, and hot sauce in a blender until smooth; refrigerate until needed.
2. Combine lemon juice, soy sauce, lemon rind, and mustard in a bowl; set aside.
3. Place bread crumbs in a shallow dish; set aside.
4. Dip fillets in lemon juice mixture, then coat in bread crumbs.
5. Place fillets on a baking sheet coated with non-stick cooking spray.
6. Bake in a 450 degree oven for 7 minutes, turn fillets over, and bake an additional 7 minutes, or until the fish flakes easily with a fork.
7. Transfer fillets to a serving platter and top each with a dollop of prepared avocado sauce.

*Large avocados are recommended for this recipe. A large avocado averages about 8 ounces. If using smaller or larger size avocados adjust the quantity accordingly.