Mix coconut milk with turmeric leaves, kafir lime leaves, lemongrass, the slices of shallots, tamarind, and paste, all together. Bring to boil until oily comes out of the soup. Meanwhile, wash clean the beef cubes, drain, then add into the soup. Stir occasionally, and cook until beef tender and soup thickened and turn in color into rich brown. Eventually, all the soups will be gone as it will be thickened.