Mix in the apple cider vinegar, salt, sugar and parsley. Stir with a small spoon or spatula.
Cover the bowl with plastic wrap and set aside until ready to use.
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Notes
The main ingredient of your relish is tomatoes, so make sure they're the best quality you can find. Ideally, use ripe, in-season tomatoes for the best flavor. The type of tomato can also impact the taste, with varieties like Roma or heirloom being excellent choices.A good tomato relish balances sweetness, acidity, and spiciness. Tomatoes are naturally sweet and acidic, but adding a little sugar can help enhance their natural sweetness, while vinegar can boost the tanginess. Depending on your preference, you might also want to include spicy ingredients like chili flakes or jalapenos. Taste your relish as you go it and adjust the flavors as necessary. A relish should be somewhat chunky, but the ingredients should still be chopped quite fine and even, so you can get a bit of everything in each bite. Too big, and it becomes a salad; too small, and it can become more of a sauce. Pay attention to your chopping to get a good, relish-like consistency.If you have time, let your tomato relish sit in the fridge for a few hours before using it. This allows the flavors to meld together and will make the relish even more delicious.Recipe can be doubled or tripled.