Preheat oven to 450F.
For the cod: Heat an oven-safe skillet over medium-high heat.
Pat the cod dry and then sprinkle the pieces with salt.
Put out three bowls, one of each with the flour, the egg, and the bread crumbs.
Decide which side of the fish you want to bread and then hold the fish fillet so that side faces down and dip it first in the flour, then the egg (making sure the egg has coated the flour), and then press it into the bread crumbs.
Place the breaded fillet to one side and then repeat the process for the other fillets.
Add the olive oil to the skillet, and then place each cod fillet, bread crumb side down, into the skillet.
Saute for 1-2 minutes, checking after 1 minute to see if the fish is golden brown.
Once it is, turn the fillets over and put the skillet in the oven. Bake the cod for 10-15 minutes, depending on the thickness of the pieces.
When done they will be flaky, and have reached a temperature of 140F.
For the salsa: Mix together all salsa ingredients in a bowl. Serve with cod.