For fish: Season with salt and pepper and bake at 375 for 10 minutes or until fish flakes easily with a fork.
Meanwhile, in a small saucepan bring wine and shallots to a boil. Let reduce by one half, about 5 minutes. Add cream. Whisk in buttter one piece at a time until fully incorporated. Do not stop whisking! At the very last minute stir in basil and tomatoes. Season with salt and pepper.