Fry the fresh or thawed beef in deep-frying oil at 200 degrees Celsius in portions until light brown. Drain in a pan and then transfer to a 3-liter Dutch oven. Add coconut water and lime juice.
Cap the onions and the garlic cloves at both ends, peel and roughly cut into pieces. Roast in the pan with the drained oil until light brown and add to the meat.
Wash the small, red chillies, cut across into thin rings, leave the seeds and discard the stalks. Wash, peel and finely grate the roots, ginger and galangal. Wash the fresh lemongrass, remove the hard stalk at the bottom, remove the brown and withered leaves and only use the white to light green parts. Cut this into pieces approx. 8 cm long. Remove the outer, green leaves if necessary. Gently crush the lower half of the pieces with a hammer. The stem should remain intact. Wash the leaves and use them whole. Break open the cardamom pods.
Put all the ingredients from chillies to cardamon seeds in the casserole, mix well and bring to a simmer. Simmer with lid for 3 hours, stirring occasionally. Remove all meat from the broth with a coarse sieve and remove all other ingredients, such as leaves, cloves, ... and the lemongrass from the broth with a finer sieve. Reduce the broth for an hour. Then add the meat and coconut milk and continue reducing until there is only about 160 ml of the sauce. Now season the rendang with salt and black pepper.
Place on the prepared serving bowls, serve as a side dish with a little sauce and enjoy.