Preheat the oven to 400 degrees F (200 degrees C).
Combine tomatoes, green beans, onion, and garlic in a large glass baking dish. Toss with olive oil to coat; season with salt and pepper.
Bake in the preheated oven, stirring occasionally, until edges of onion are slightly charred and green beans start to look dry, about 40 minutes. In the meantime, mix water, curry powder, and ginger together.
Remove dish and stir the vegetables; stir in curry mixture. Increase oven temperature to 450 degrees F (230 degrees C).
Lay cod over the bottom of the dish and coat with vegetables. Continue baking until fish is opaque, 25 to 30 minutes depending on thickness.
