Preheat the oven to 300°F or 150°C.In a small bowl, add 3 tablespoons extra virgin olive oil, 2 tablespoons sugar, 2 cloves garlic (grated), 2 teaspoons dried oregano, and 1 teaspoon salt. Stir well and set aside.
Cut 1 pound cherry tomatoes in half and arrange them on a baking tray, cut side up, in a single layer, without overlapping.With the help of a teaspoon, season each tomato with the dressing.
Slow roast the tomatoes in the oven for about 1½ hours at 300°F or 150°C.Before serving, baste the tomatoes with the juice released on the baking tray.