Preheat the oven to 350 degrees F. In a large casserole or Dutch oven, heat the oil over medium heat. Add the onions and saute until softened, about 5 minutes. Add the cabbage and salt to taste, cover, and cook over low heat, stirring often, until wilted, about 5 minutes. Add the garlic, cumin, and rice and saute about 2 minutes. Add the stock, red pepper flakes, oregano, tomatoes, and black pepper to taste. Mix well and bring to a boil. (Add additional salt if you like to taste.)

Remove from the heat, cover, and bake 30 minutes, or until the rice is tender. Taste and adjust the seasonings. Serve hot.