1. Put vegetable oil in a wok over medium heat and add the red curry paste, stir well. Then add half cups coconut milk and stir until mixed well.
2. Put the roasted duck and stir well. Then pour the mixture into a pot, add the remaining coconut milk, water, cherry tomatoes, pineapples, cherry eggplants, kaffir lime leaves, sweet basil leaves , seasoning with sugar, salt, and fish sauce.
3. Continue stirring until boiling and remove from stove. Transfer to a serving bowl.