Prepare polenta by adding it to 1 quart of boiling water, with a pinch of salt. Stir around for about 15 minutes, until smooth. Remove from the heat and add the butter and the Parmesan. Taste, and season, then pour into a tray and leave to chill in the refrigerator.
Now make tomato sauce. Heat a pan, add a little olive oil and slowly fry off your onion until golden. Add the plum tomatoes, basil, and sun-dried tomatoes and continue to simmer for a few minutes. Taste, and season.
Turn out the chilled polenta and cut it into 1-inch (2-centimeter) wide fingers. Place the pieces onto skewers then brown them on all sides in a hot frying pan. Serve the polenta skewers with the 'blood red' tomato sauce.