Rub tuna steaks with olive oil and season with salt, pepper and garlic powder.
Tear heavy duty foil that will fit the size of your steak in order to make a packet.
Spray bottom of foil with PAM.
Place tuna steak on foil.
In a bowl, combine the pico, onion, mushrooms, tomatoes, lemon juice, soy sauce and season with salt and pepper.
Divide the pico mixture evenly between the steaks.
Place 2-3 lemon slices on each steak.
Drizzle with thick balsamic vinegar.
Fold the sides of the foil over the fish and cover completely. Seal packets closed. Place on heavy duty baking sheet.
Bake at 400 for 30-40 minutes depending on how rare you like it.
Remove from oven. Open packets and slice the tuna steaks. If they are too rare, just leave foil open and place back in oven to get to the desired temperature.
Recipe by Geaux Ask Alice! at https://geauxaskalice.com/spicy-baked-tuna-steaks-wrapped-in-foil-packets/