The tamarine sour soup base concentrate, coconut milk and Masaman curry paste can be found in any good Asian Food market.
Start by cutting up the onion into the desired size pieces you want in your curry. Use 1 or 2 onions depending on your likeness for them.
Cut up the potato into bite size pieces.
In a large pot, combine the chicken, coconut milk and one can full off water. Boil chicken until it is tender but not falling apart.
When the chicken is about 5 minutes from being done add the potato, onion sugar and salt.
Next, in a wok or a large skillet, start making your curry paste.
Laddle some coconut milk and water from the cooked chicken and add the curry paste. Simmer about 10 minutes.
Next, add the rest of the chicken, potatoes and onion to the curry paste.
Next, add the chick peas and tamarine sour soup base concentrate. Simmer to finish cooking the potato and onions.
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