Salt and pepper the cod fillets on both sides. Set aside.
Begin by heating the oil in a skillet. Once warm, add the garlic and shallots. Sauté for 3 - 5 minutes. Cook them until they have a nice browning.
Remove from the skillet and set aside. Add the tomatoes to the skillet and simmer until they blister and the liquid is released. Once the sauce is a sauce, add in the cod. Simmer for 5 - 7 minutes.
To serve, add the tomato sauce to a bowl and top with cod. Then, top the cod with the sautéed shallots and garlic. Enjoy!