First, bring water to a boil and cook the quail eggs for 3-4 minutes. Transfer them to an ice bath to stop the cooking, then peel and set aside.
Heat butter in your pan over medium heat until melted. Add your chopped onions and cook until they become clear and soft, about 2-3 minutes. Add minced garlic and cook for another 30 seconds until fragrant. Pour in fish sauce and cook for one more minute.
Add your diced carrots and singkamas to the pan, stirring them with the onions and garlic. Pour in water or chicken stock. Let it come to a boil, then lower the heat and simmer for 7-10 minutes until the vegetables are tender but still have a slight crunch.
Add the green peas and stir. Slowly pour in the cream while stirring continuously. Add your peeled quail eggs. Season everything with salt and pepper to taste.
Let it simmer gently for 2-3 more minutes until the peas and eggs are heated through and the sauce has thickened slightly. If you want a thicker sauce, mix 1 teaspoon of cornstarch with 2 tablespoons of cold water and stir it into the pan.
Serve hot with steaming white rice. The vegetables should still be slightly crisp, and the sauce should be creamy and smooth.
Remember: Keep the heat low when adding the cream to prevent it from curdling, and don't overcook the vegetables – they should still have a nice bite to them.