Heat oil in nonstick frying pan and add minced garlic. Cook about 1 minute. If you have a food mill just quarter tomatoes , if you don't peel, seed and dice. . Add tomatoes to pan with sugar and 1/2 teaspoon basil and 1/2 teaspoon salt and bring to a simmer. Reduce heat to medium low and cook 20-30 minutes stirring often so as not to stick. If tomatoes very juicy might take longer. Toward the end taste add more seasoning if needed.
Pulse the sauce in a food processor with a steel blade. If using a food mill put through medium blade.