In a bowl or a mason jar, combine the vinegar, sugar, salt, pepper, and olive oil - use a whisk and combine well.
Cut the tomatoes in half and slice the onions into quarters.
Add the onions to a bowl along with 2 tablespoons of the dressing. Combine this well. Time permitting, let this marinate for 5 minutes. Tip - Marinating the onions with the dressing first takes away the raw taste of onions and softens them up.
Then, add the tomatoes, remaining dressing, and parsley. Combine well.
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