Remove the spinach from the saucepan and place in a bowl to cool. In the meantime, in a warmed saucepan, add a little bit of olive oil, the rest of the garlic, the basil sprigs and the tomatoes. Pour in a bit of water from the tomato can. Bring to a boil, lower the heat and let it cook at low heat. Season to taste and add the sugar. Let cook at low boil for 10 minutes or until you reach your desired consistency. Taste and adjust the seasoning.