Herb Watermelon Feta Salad

Ingredients

• 1/2 large chilled seedless watermelon, cut into 1-inch cubes
• 1 small red onion, sliced
• 1 cup thinly sliced fresh basil leaves
• 1 cup chopped fresh cilantro
• 1/2 cup minced fresh mint leaves
• 2 limes, juiced
• 1 (4 ounce) package crumbled feta cheese
• 3 tablespoons olive oil
• 2 tablespoons balsamic vinegar, or more to taste
• salt and ground black pepper to taste