Avocado and walnut salad

Serves 4 as a side salad

2 ripe avocados, sliced
1/2 red onion, thinly sliced
1/3 cup toasted walnuts
2 large handfuls arugula (rocket) leaves
2 tablespoons olive oil
2 tablespoons organic apple cider vinegar

Combine all ingredients except oil and vinegar in a serving bowl and toss gently.
Drizzle oil and vinegar over the salad and serve.