Watermelon Feta Arugula Salad in Jars

Bahan-bahan (4 porsi)

• 4 cups diced seedless watermelon
• 3 oz crumbled feta
• 3 cups baby arugula
• 1/4 small red onion (chopped)
• 2 tbsp balsamic vinegar
• 2 tbsp extra virgin olive oil
• 1/8 tsp kosher salt
• fresh black pepper