Creating Marinated Cucumbers, Onions, and Tomatoes is a simple process if you follow these steps:

1. Prepare the Vegetables: Rinse the cucumbers, onions, and tomatoes. Slice the cucumbers and onions thinly, and halve the tomatoes. Place them in a large mixing bowl.

2. Make the Marinade: In a separate bowl, whisk together the apple cider vinegar, olive oil, sugar, salt, black pepper, and oregano if using. Stir until the sugar has dissolved.

3. Combine: Pour the marinade over the sliced vegetables in the bowl. Toss everything together to ensure all the veggies are coated.

4. Marinate: Cover the bowl with plastic wrap or a lid. Let it sit at room temperature for 30 minutes or refrigerate for a few hours or overnight for best flavor.

5. Toss Before Serving: After marinating, give the salad a gentle toss to redistribute the marinade evenly.

6. Garnish: Before serving, sprinkle fresh parsley on top for color and flavor.

7. Store Leftovers: If you have any leftovers, store them in an airtight container in the fridge for up to 3 days.

By following these straightforward steps, you’ll create a beautiful dish that will wow your family and friends.