Preheat oven to 400 degrees. Put tomatoes in a baking pan. Drizzle the olive oil, balsamic vinegar over tomatoes. Salt and pepper and add a little basil. Roast stirring occasionally for 10-20 minutes, or until they look well roasted, and soft. Remove from oven, put aside. Cover with foil to keep warm. Drizzle with a little more Balsamic optional.
You can also try making them in a sauté pan on high heat. Works out pretty well. But, you have to add more balsamic if you use this method..