Preheat oven to 325° F.
Heat 1 tbsp oil in a large braising pan or dutch oven over medium-high heat. Coat venison in five spice seasoning. Brown on all sides, then remove from pan and set aside.
In the same pan, heat the remaining 1 tbsp of oil. Saute onion and garlic until softened and fragrant, about 2 minutes. Add carrots and quince, saute for an additional 2-3 minutes longer.
Return venison to pan. Lightly crush the cardamom pods to crack open the outer case (don't break them apart). Add them to the pan, then stir in the wine and broth. Bring to a simmer.
Cover the pan and transfer to the oven to roast at 325°F for 1.5 - 2 hours, or until the meat is very tender. Turn the meat every 30 minutes, and add additional broth if things are looking too dry )the liquid should reduce some during cooking, but it should remain somewhat soupy).
Remove venison from the pan and set aside. Trim and discard stems from roselle leaves, then cut them into thin strips. Stir in pan. Cover and return to oven for 30 minutes, or until greens are tender.
Transfer venison to serving dishes, and serve covered with the stewed quince and vegetables.