Here's one I tried recently.
Saute lightly in a mixture of olive oil and butter:
1 medium onion diced fine
2 cloves garlic finely chopped
1/2 of a fennel bulb diced fine
While the veg are sauteing add 1 tsp of crushed chiles (more or less dependent on taste). Season with salt and pepper.
Add 1/2c of white wine, 1/2c of fish stock and a small can of diced tomatoes. Season again and reduce mixture by half over medium heat.
Take walleye fillets and slice in half lengthwise and if they are thick fillets slice in half to make them thinner. I had smaller fillets when I made mine. Using a lightly greased muffin tin, coil fillets in each tin and spoon over reduced sauce. Top with cracked pepper and bake until done at 400deg. Remove from tin an plate adding more heated sauce if needed.
I can see this type of presentation not working if your fillets are too big for the tin as there needs to be enough room in the tin for enough of the sauce. If that's the case you can use a baking dish and just layer the fish and the sauce and bake until done.