Peel the greenest bananas you can find, split them lengthwise as for a banana split, & cut each half into 4 pieces. Mix the SAUCE ingredients with 1 c water. Add banana chunks & bring to a gentle boil. Reduce the heat to low & cook for 5 minutes (if the bananas are not green enough they will go mushy). Put into individaul serving bowls, sprinkle with toasted sesame seeds & serve hot.