Bring a medium-to-large pot of water to the boil. If using broccolini, cut any with thicker stems in half length-ways; if using broccoli, chop into bite size florets. Boil broccolini/broccoli and noodles (snapped in half) for no more than 3 minutes (to avoid overcooking), drain, then run under cold water to stop the cooking process and drain again.
Toss broccolini/broccoli, noodles, cabbage/bok choy, peanuts and 1 teaspoon of the sesame seeds together. Sprinkle remaining toasted sesame seeds over avocado half.
When ready to serve, toss noodle salad with extra-virgin olive oil and dressing.
Divide salad and avocado between plates and scatter with coriander. Serve with lime wedges (if using) to squeeze½ over just before eating.