In a medium bowl, stir together the Tony's, cayenne, thyme, oregano, and sugar. Use mixture to season both sides of the fish liberally and set aside.
To make the succotash: In a nonstick frying panover medium heat, add 1 Tablespoon of olive oil. Add the onion and garlic and sauté for 3 minutes.
Add the butter, corn and green beans and gently cook until the corn and beans just start to soften, about 2 minutes.
Toss in the tomato, basil, and fresh lemon juice. Taste and season with salt and pepper as needed. Keep warm while cooking the fish.
Heat a large cast-iron skillet over medium-high heat until it just starts to smoke. Add olive oil and walleye fillets to the hot skillet. Let them cook for 2 minutes. Flip the fish and finish cooking, about 1 minute more.
Divide the succotash between the dinner plates and top with the blackened walleye.