Step 1: Combine vegetables: In a large bowl, toss together cucumber, tomatoes, and red onion.
Step 2: Add flavor: Pour in lemon juice and red wine vinegar. Add sea salt and several grinds of black pepper.
Step 3: Chill briefly: Place the salad in the refrigerator for about 10 minutes.
Step 4: Transfer carefully: Move salad to a serving bowl, leaving excess juices behind if desired.
Step 5: Finish the salad: Drizzle with olive oil, sprinkle with fresh herbs, and toss gently.
Step 6: Final seasoning: Add flaky sea salt and extra pepper to taste before serving.