Cod steak on a bed of leeks and mushrooms

4 cod steaks (about 6 ounces each)
2 tablespoons olive oil
Salt and pepper to taste
1 tablespoon lemon juice
Fresh herbs for garnish (such as parsley or dill)
For the Leeks and Mushrooms:

2 tablespoons butter
2 leeks, thoroughly cleaned and sliced (use the white and light green parts)
8 ounces mushrooms, sliced (such as cremini, shiitake, or button mushrooms)
2 cloves garlic, minced
1/2 cup vegetable or chicken broth
1 teaspoon fresh thyme or 1/2 teaspoon dried thyme
Salt and pepper to taste

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