In a large saute pan over medium heat, heat the olive oil. Add the bay leaves, garlic, shallots, 1/2 chopped onion, and jalapeno pepper and saute for 2 minutes. Add the boiled zucchini and fresh oregano and then continue to saute for 1 minute. Add the minced tomato, white wine, and water, stir, and remove from the heat.
Poach the mahi mahi fillets in water a large saute pan; cook until a knife slides in easily and fish is opaque throughout.
Meanwhile, heat the butter in a small saute pan. Add the white mushrooms, additional minced onion, and salt, to taste. Saute until the mushrooms are cooked through.
Distribute the oregano sauce among 4 serving plates, and then top with the mahi mahi. Top the fish with the mushroom and onion mixture.
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