Preheat oven to 350ºF
In an oven-proof skillet over medium heat, add oil and butter. When it starts sizzling, add onions and season generously with ground sea salt. Sauté until translucent, about 3:30 to 4 minutes.
Season onions with curry powder, cumin, ajwain, turmeric and coriander. Cook until fragrant, 1:30 minutes.
Add beef and lamb; season with freshly ground black pepper. Break the meat into small pieces and cook until no longer pink. Halfway through, add ginger and garlic. Continue cooking until the meat is done.
Add tomato paste and stir to coat before adding mango chutney, lemon juice, raisins and lemon zest; mix well.
Stir in panade and reduce the heat to medium-low. Cook for 5 minutes, stirring occasionally; taste and adjust seasonings if needed.
Using the back of a spoon or spatula, level out the top of the mixture, compressing at the same time. Slowly, evenly pour on the egg custard.
Carefully transfer to the preheated oven and place bay leaves on top forming a pattern. Bake for 45 minutes or until the custard is set and the top is golden brown.
Remove from the heat and let it rest for 10 minutes before serving with yellow rice.