Season the fish with salt and pepper.
Heat up the EVOO in a skillet on medium-high flame. Sear the fish skin side down for 4 minutes and flip to sear for another 4 minutes. Take out of the pan.
Heat up the EVOO for marinade in a pan on medium flame. Add in the garlic, olives and cilantro. Sauté for about 5 minutes.
Pour in the lemon juice and cook until it evaporates. Add in both types of tomatoes. Season with the swerve, salt and pepper.
Put tomato marinade on the plate and put the fish on top.