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Export 3 ingredients for grocery delivery
Step 1
Place tomatoes, water, and olive oil in a blender or food processor; blend until smooth. Transfer tomato mixture to a large pot.
Step 2
Stir sugar, garlic salt, and vinegar into tomato mixture and bring to a boil. Reduce heat to medium-low and simmer until thickened, 1 to 2 hours, stirring occasionally.
Step 3
Pour tomato sauce into a clean blender or food processor no more than half full. Cover and hold lid down; pulse a few times before leaving on to blend. Puree in batches until tomato sauce is very smooth.