Heat oil in a stewing pot, add garlic and allow it to brown in the pot leaving its flavor in the oil. Remove garlic from oil. In a small bowl, combine half of the curry powder and half of the water to make a paste. Add curry paste mixture, coconut cream and half the chopped ingredients, and spices. Allow to reduce by half, about 15 minutes. Add clams, the other half of the curry powder and water and remaining ingredients to pot, cover and simmer 15 to 20 minutes until clams are tender (adding more water if needed to maintain a thick gravy).
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