Cut catfish fillets to approximate size of slider roll. Use smaller pieces to fry and enjoy while you are cooking.
Combine flour, cornmeal and salt. Coat catfish with mixture.
Add vegetable oil to medium-sized heavy skillet. Heat to 350˚ F. Fry fillets for 5 to 6 minutes or until golden brown. Remove catfish from oil, and drain on paper towels.
Brown sliced and lightly buttered slider rolls in skillet. Add wasabi mayo to top and bottom of roll. Assemble with the lettuce, onion, tomatoes and avocado. Garnish with a decorative toothpick.
To make sauce, combine all ingredients thoroughly. Taste and adjust seasonings. Cover and refrigerate until ready to use.