Heat a large non-stick pan over a medium-low heat with the ghee. Once hot, add the onion with a pinch of salt. Fry for 7-8 min until softened. Once softened, add the ginger garlic paste, smoked paprika, curry powder, garam masala and a pinch of chipotle powder (spicy!). Fry for 2 min. Add the tomato paste, stock cube and measured water. Simmer for 5 min.