Rinse the cherry or grape tomatoes under cool water, then slice them in halves or quarters. Arrange them in a large mixing bowl.

Drizzle extra virgin olive oil and red wine vinegar over the sliced tomatoes. Add green onions and red onions, stirring gently to combine.

If using optional ingredients, add cucumber, feta, and avocado now, folding gently into the salad mixture.

Sprinkle sea salt and black pepper over the salad and toss to coat.

Fold in chopped parsley for freshness. Serve immediately or chill for 30 minutes before serving.