Good tomato sauce can be made from fresh or canned tomatoes. When fresh tomatoes are at their peak, it may be a good idea to use them exclusively. At other times of the year, good-quality canned tomatoes are a better choice. A good tomato sauce is opaque and slightly coarse, with a concentrated flavor of tomatoes and no trace of bitterness or excess acidity or sweetness. The ingredients selected to flavor the sauce should provide only subtle underpinnings. In this Chef’s Tip, learn to make this staple of the kitchen at home with professional results.