If you like a smooth sauce, pulse tomatoes in a food processor in batches to the consistency you like and transfer to the large stockpot. If you like a chunkier sauce skip processing, roughly chop and place tomatoes in stockpot. Bring the tomato sauce to a simmer over medium heat. Continue simmering for 30 to 90 minutes, stirring occasionally, until the sauce reaches the taste and consistency you like. When finished cooking, stir in lemon juice or vinegar oil and salt. Add more lemon juice or vinegar to taste.