Start by cutting the watermelon into cubes. Use a sharp knife to slice the watermelon in half, then cut each half into thick slices. Finally, cut each slice into bite-sized cubes, approximately 1-inch in size.

Next, wash the cucumber to remove any dirt. Dice the cucumber into small pieces that are similar in size to the watermelon cubes for uniformity in texture.

Take your red onion and peel off the outer layer. Slice the onion thinly, aiming for rings that can be easily broken apart.

Rinse the fresh mint leaves under cold water to remove any residual dirt. Pat them dry with a paper towel, then roughly chop the leaves.

In a large mixing bowl, combine the diced watermelon, cucumber, sliced red onion, and chopped mint. Gently toss the mixture to ensure everything is evenly distributed.

Sprinkle the crumbled feta cheese over the top of the salad. Be careful not to stir too vigorously; you want to keep the feta intact for a creamy burst in each bite.

In a small bowl or jar, mix the olive oil and balsamic vinegar together. Season with salt and pepper to taste. Whisk or shake to combine thoroughly.

Drizzle the dressing over the salad just before serving. Toss the salad gently to ensure the dressing coats each ingredient evenly.

Transfer the salad to a serving platter or individual bowls. Enjoy immediately for the freshest taste!