Directions

1. Preheat the oven to 425F.

2. Using 1 tablespoon of olive oil, coat the bottom of a baking dish and place the lemon slices in the bottom of the baking dish. Rub fish filet with salt and place in the center of the dish on top of just a few lemon slices, leaving some lemon slices uncovered. Roast in the oven for 20 minutes.

3. Meanwhile, in a bowl, make the best basic tahini sauce. Set aside.

4. Heat the remaining tablespoon of olive oil in a wide skillet and cook the onions over medium heat until very tender and just beginning to brown, about 10 minutes. Add onion to the tahini sauce.

5. Remove the fish from the oven and pour the tahini onion sauce over it. Return to the oven and roast for another 30 minutes, or until the sauce is thick and the lemon slices are well browned.

6. Discard the lemon slices under the fish, as they will be bitter. Eat warm or at room temperature, with chopped parsley or cilantro.