Reduce heat and let it simmer and thicken up for a few minutes or until ready, stirring all the time.
To cook the polenta, bring a pot of the salted water to a boil. Add the polenta and bring to a boil, constantly stirring with a whisk.
To prepare the tomatoes topping, melt the butter. Saute the tomatoes at over medium heat, for 3-5 minutes or until the tomatoes start to wilt. Add the balsamic, basil paste, sugar, pepper and salt (if using) and cook for a few additional minutes. Off the heat.