Make the sauce by mixing together all ingredients except the chicken and the grapes. Season to taste (sample by dipping a grape into the sauce and then eating it).
Broil the chicken breasts (3-5 minutes on each side in a preheated broiler), then dice or shred into small bite-sized pieces.
Mix chopped chicken with about 2 cups of whole grapes. Cover with the sauce. Add more grapes to taste. My taste is to add vast quantities of grapes.
* Chicken fruit salad curry -- One day I was invited to a beach picnic, and asked to bring a salad. A friend and I got together in his kitchen and concocted a curried chicken salad with grapes. It was delicious, but we forgot to write down the recipe. After some more experimentation, I have come up with this recipe. I don't know if it is the same as what we made that day at the beach, but it is delicious.