2 tablespoons vegetable oil
1 medium onion, finely chopped
3 celery stalks, finely chopped
1 medium green bell pepper, cored, seeded and finely chopped
1/2 pan prepared cornbread, finely crumbled
3 large eggs, lightly beaten
2 cups shucked oysters, cut into thirds
1 bunch scallions (green and white parts), coarsely chopped
1/2 bunch flat-leaf parsley, coarsely chopped (about 1/2 cup)
2-1/2 teaspoons salt
1-1/2 teaspoons ground black pepper
1-1/2 teaspoons poultry seasoning
1/4 teaspoon dried thyme
Heat the vegetable oil in a large skillet over medium heat. Add onion, celery and bell pepper and cook, stirring for 5 to 8 minutes, until the vegetables begin to soften. Remove from heat and set aside.
Preheat the oven to 350 degrees. Grease a 9- by 12-inch baking dish with vegetable shortening.
In a large mixing bowl, combine all ingredients including stock, using your hands or a fork. Transfer the mixture to the prepared baking dish, cover with foil and bake for 1 hour. Uncover the dish and bake an additional 20 minutes, until the top is golden brown and crusty. Let sit at least 15 minutes before serving.