Watermelon and Feta Salad

Ingredients

• • 1/3 cup (75 ml) olive oil
  • 2 tablespoons (30 ml) balsamic vinegar
  • 1/2 medium red onion, thinly sliced
  • 3 cups (750 ml) seedless watermelon cut into 1-inch (2.5-cm) cubes
  • 1 cup (250 ml) feta cheese cut into 1/2-inch (1.25-cm) cubes
  • 4 cups (1 litre) arugula
  • 1/4 cup (60 ml) pumpkin seeds, toasted
  • Sea salt and freshly ground pepper