Add a large drizzle of olive oil to a sauté pan. Once hot, add in the shallot and garlic and sauté for a minute over medium to high heat.
Add the fennel and sauté for another minute.
Pour in the white wine and sauté for another minute, allowing the alcohol to evaporate and the flavor to be absorbed.
Add the tomatoes and mix together.
Meanwhile, add the sea salt into the water, mix and then pour into the pan. Add in the capers and hot pepper flakes and mix together. Lower the heat to medium and allow to cook for two minutes, bringing to a simmer.
Add the cod fish fillets into the pan and scoop the sauce on top of the fillets. Sprinkle with some of the chopped parsley. Lower the heat to medium/low and cover with lid. Let cook for 20 minutes. Depending on how thin or thick the fillets are, it may take less or more time to cook.
Remove from heat and enjoy with another sprinkle of fresh parsley on top.