In a skillet over medium-high heat the coconut oil. Add the onion, garlic, and serrano pepper. Cook until onions starts to golden, about 5-7 minutes. Add the ground coriander, turmeric, garam masala, and paprika, cook for an additional 2 minutes. Add the coconut milk, tamari, and coconut sugar. Whisk together. Allow to simmer until thickened, about 20 minutes, whisking occasionally.
While the sauce is simmering, bring a large pot of well-salted water to a boil. Cook the pasta according to it's instructions. 5 minutes before the cooking time is up add the broccoli rabe. Cook together for 5 minutes. Strain and place in a large bowl.
Once the sauce is thickened whisk in the cilantro. Combine the sauce and the broccoli rabe pasta. Serve immediately!