Preheat the oven at 475 degrees.
In a small bowl, add the butter, garlic, thyme, 1/2 teaspoon salt, and pepper. Zest the lemon right into the bowl (reserve the whole lemon). With a fork, mash the butter to smoothly combine all of the ingredients. Cut the whole lemon into thin slices.
Tear off 4 squares of parchment that are at least 12 inches on each side. Lay the sheet flat on a work surface. Place 1 fish fillet so that it runs vertically top to bottom. Lightly sprinkle the fish with salt and black pepper. With the back of a small spoon, spread one-quarter of the butter mixture on top of the fish. Lay 2 slices of lemon on top of the butter mixture and scatter sliced tomatoes and onions around the fish.
Lift the right and left sides of the paper up and towards the center, directly above the fish. Touch the two sides together and tightly roll them, folding as you go, until you reach the fish. Now, roll and crimp the top and bottom ends, rolling them towards the counter, away from the center of the fish. When you reach the end, tuck the end underneath the fish.
Place in the oven and bake for 12 to 15 minutes, until the fish is fully cooked through and flakes easily with a fork. Serve warm with reserved lemon slices .
Preheat the oven at 475 degrees.
In a small bowl, add the butter, garlic, thyme, 1/2 teaspoon salt, and pepper. Zest the lemon right into the bowl (reserve the whole lemon). With a fork, mash the butter to smoothly combine all of the ingredients. Cut the whole lemon into thin slices.
Tear off 4 squares of parchment that are at least 12 inches on each side. Lay the sheet flat on a work surface. Place 1 fish fillet so that it runs vertically top to bottom. Lightly sprinkle the fish with salt and black pepper. With the back of a small spoon, spread one-quarter of the butter mixture on top of the fish. Lay 2 slices of lemon on top of the butter mixture and scatter sliced tomatoes and onions around the fish.
Lift the right and left sides of the paper up and towards the center, directly above the fish. Touch the two sides together and tightly roll them, folding as you go, until you reach the fish. Now, roll and crimp the top and bottom ends, rolling them towards the counter, away from the center of the fish. When you reach the end, tuck the end underneath the fish.
Place in the oven and bake for 12 to 15 minutes, until the fish is fully cooked through and flakes easily with a fork. Serve warm with reserved lemon slices .