Season oxtail well on all sides with salt and pepper.

In a dutch oven (or large pot), drizzle olive oil all over the bottom and brown all sides of each ox tail. Once they are all brown, remove and place them in a bowl. Add the onion and garlic to the pot, sautee until soft and translucent.

Return the oxtail, plus all the juices that have collected in the bowl, into your dutch oven. Add the spinach and kale and pour in the beef broth. Cover, bring it to a boil and then reduce heat. Let it simmer for 3 hours. Once the meat is tender and falling off the bone, toss in the carrots and cook until they are soft.

This dish is thicker than most broth-based soups but not as thick as stew. I love this stew just like it is on a cold day. But it's also delicious over rice or with egg noodles.