Honey Butter Japanese Sweet Potato     I always serve this dish with Tonkatsu. It is not too sweet and the flavors blend perfectly with the Tonkatsu sauce that is served with the pork.   1 sweet potato 2 tablespoons butter 2 tablespoons honey 2 teaspoons soy sauce 2 tablespoons water 1 teaspoon black sesame seeds   Wrap the sweet potato in cling wrap and microwave for 3 to 4 minutes.* Cut into 1 1/2 inch thick strips. Melt bu