Boil beef in broth and salt for 1 hour. Saute onion and jalapeno in oil until well browned about 10 minutes. Add shrimp paste, coriander, turmeric and lemon grass. Saute for 2 minutes. Add salt, sugar and tamarind water, simmer for 2 minutes. Transfer this mixture to the beef. Simmer for 45 minutes and serve over rice.