In sauce pan combine yam with water, chiles, toamto onion and salt. Bring to boil, simmer 10 minutes, remove tomato and chiles set aside. Continue to simmer 10 more minutes. In food processor, belind chiles, tomato, and shrimp paste to form a paste. Add thsi to potato onion mixture. Add fish or shrimp, cut watercress and add to pan, bring to boil, cook 15 minutes. Serve over rice.
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