Watermelon, Arugula and Feta Salad

Ingredients (8)

• 1 tbsp olive oil
• 0.25 tsp black pepper
• 0.25 tsp salt optional
• 3 cup seedless watermelon cubed and chilled
• 2 tbsp balsamic vinegar
• 0.25 small red onion thinly sliced
• 7 oz arugula
• 0.33 cup crumbled feta reduced-fat