In a large pot, heat the coconut oil over medium heat until shimmering. Add the finely sliced onion, sautéing for about 5 minutes until translucent and fragrant. Stir in the minced garlic and grated ginger, cooking for an additional 2 minutes until the mixture is aromatic and just begins to brown.

Introduce the red curry paste, ground cumin, turmeric, cinnamon, and optional chili flakes to the pot. Mix well and toast the spices for about 1 minute. Next, add the beef chuck or stew meat, browning the pieces for 5-7 minutes.

Pour in the full-fat coconut milk and beef broth, stirring to combine all ingredients thoroughly. Add the tomato paste, brown sugar or honey, and fish sauce, mixing until the sauce is uniform. Allow this mixture to simmer.

Reduce the heat to low, cover the pot, and let the curry simmer gently for 2-3 hours. Stir occasionally. The beef is done when it is fork-tender.

Serve the Coconut-Infused Beef Curry hot over fluffy jasmine rice, adding fresh herbs or a squeeze of lime if desired.