| 3 tablespoons vegetable oil |
| 1 small red bell pepper, chopped |
| 1/2 small eggplant, peeled and chopped, about 1 cup |
| 1 small zucchini, chopped |
| One 10-ounce package frozen spinach, thawed, chopped, and drained |
| 1 pound halibut fillets or other firm-fleshed white fish |