Heat the ghee (or olive oil) in a large skillet over medium-high heat.
Lightly season fish with salt, pepper and thyme then sear 2 to 3 minutes per side. Remove from pan and leave pan over medium heat.
Heat a little olive oil in the pan; add tomatoes and sauté for 1 or 2 minutes. Add wine and lemon juice; give it another stir.
Serve tomato sauce over fish.