Preheat oven at 400°F. In a large oven safe pan, place tomatoes, bell peppers, wine, chicken stock, capers, shallot, garlic, and red pepper flakes into the pan and combine. Season with salt and pepper. Cover with a lid or tin foil and bake for 15 minutes.
Rinse and pat dry fish, and then nestle fillets into the pan. Add a little dollop of butter to each piece of fish. Return the pan to the oven for another 10 min or so, depending on the thickness of your fish.
Remove and serve with sushi rice and top with basil.