The lemon tarragon sauce gives this mild tasting fish a lovely French flair. It's a fresh flavor that pairs beautifully with steamed veggies or a fresh green salad.
Spread olive oil evenly over the bottom of the dish so the fish doesn't stick.
Place the tilapia fillets in the dish skin side down. With a fork, poke several holes in the fillets and then pour 1 Tablespoon on lemon juice evenly over each one.
Sprinkle with salt & pepper, and 1 tsp of dried tarragon over each fillet.
Now put the sliced onion over the fish and top with the mushrooms.
Place in the preheated oven and bake for 20 minutes.
After 20 minutes, put the lemon slices on top of the mushrooms and return to the oven for another 10-12 minutes.
The fish is done when it flakes easily with a fork. If your fillets are thick they may need a little more time.
To serve, spoon the sauce over the fillets on the plate and garnish with extra lemon slices