Preheat the oven to 400ºF. Cut the cabbage in half lengthwise. Wrap each half very tightly in aluminum foil and place on a cookie sheet. Bake the halves until they are very soft—about 40 minutes. Check by piercing with a fork. Take them out of the oven and set aside so they cool enough to handle.
Next, in a deep skillet, heat 2 tablespoons of the cooking oil over medium. Add the shallots and garlic and sauté until they are beginning to soften. Add the rice and sauté some more, until it is fragrant and a bit toasty. Then add in the tomato paste and the paprika and continue to sauté, caramelizing the tomato paste, for 2 or 3 minutes. Then add in the cayenne pepper, black pepper, tarragon, and the meats. Cook briefly.
Then add the tomatoes, crushing them with your spatula, and then pour in the wine (or stock). Rinse out the tomato cans with a bit of wine or stock and add that in too. Stir everything together, bring to a gentle boil, reduce the heat and simmer for a few minutes.
While you are simmering the sauce, carefully take apart the roasted cabbage. Try not to tear the leaves, but don't worry about it if you do.
Coat the springform pan with oil. If yours, like ours, enjoys leaking, wrap the base in foil. Coat the bottom of the pan with a big spoonful of the sauce. Then layer cabbage leaves all over—use about a quarter of the leaves. Then add a layer of sauce, using ab0ut half the remaining sauce, then another layer of cabbage leaves, then the rest of the sauce, and finish with the rest of the cabbage. If you have any leftover pieces—torn bits, thick chunks—mince them up and add them to the top layer. (If you have a lot of cabbage left over, save it—you can heat it with some butter and a little water for a side dish with another meal.)
Tightly cover the top of the pan with more aluminum foil, slide it in the oven, and bake for 75 minutes. Take it out of the oven, remove the foil, put back in the oven, and bake another 15 to 20 minutes, until the top is beautifully golden brown.
Take the cabbage cake out of the oven and let it rest on a rack for at least 15 minutes. Then it's ready to serve. Serve it in the same way as a cake, in wedges. So good.