Start off by heating your olive oil and butter in a large pot over medium heat. Once it’s shimmering, toss in the chopped onion. Stir it around until it turns golden and soft, which should take about 5 minutes. Cooking the onion properly is crucial; it’s the base that adds sweetness and depth. Next, add in the minced garlic and grated ginger. You'll know you’re on the right track when you can smell the fragrant combination wafting through your kitchen. Sauté these together for another minute.

Now it’s time for the fun part! Sprinkle in the ground turmeric, ground coriander, crushed cardamom pods, and cumin seeds. Stir everything together and allow the spices to toast for a minute. This step is vital; it activates the spices, really enhancing the overall flavor of your curry.

With the spices mixed in, add your diced braising beef to the pot. Keep stirring to sear the meat on the outside. You don’t need to cook it through; just get a nice browning going. This should take about 5 to 7 minutes. All those brown bits at the bottom of the pot? They are flavor bomb central!

Once the beef is browned, pour in the can of chopped tomatoes and the beef broth. The liquid will deglaze the pot and lift those wonderful flavors stuck to the bottom. Stir in the brown sugar, it helps to reduce acidity from the tomatoes. Bring the mixture to a gentle boil, then reduce the heat to a simmer.

Let the curry simmer for about 1.5 to 2 hours. This slow cooking is where the magic really happens. The beef becomes incredibly tender and soaks up all the spices. It’s worth the wait, I promise! Make sure to check on it occasionally and give it a good stir.

About 10 minutes before serving, stir in the heavy cream. This step transforms your curry into a velvety sauce. Add the garam masala and season with salt and pepper to taste. Just before serving, sprinkle over the fresh coriander and cayenne pepper for an extra kick.