Steam or boil the broccolini in a pot of salted water for about 3-4 minutes until tender-crisp. Then immediately plunge it into ice water (or run under very cold tap water). This stops the cooking process and locks in that vibrant green color.
Assemble the salad with the salad leaves, prosciutto, avocado, radishes, Feta and red onion.
To make the dressing, combine the oil, mustard, garlic and water in a small jug or bowl. Whisk until combined. Drizzle the dressing over the salad and serve!
Notes
Don't Skip the Ice Bath: I can't stress this enough—plunging the broccolini into ice water immediately after boiling is the secret. It locks in that vibrant green colour and stops it from turning mushy.
Selecting the Best Broccolini: Look for stalks with tight, firm florets. If they are starting to yellow or flower, they will taste bitter and woody.
Avocado Ripeness: You want an avocado that yields slightly to pressure but isn't squishy. If it's too soft, it will turn into guacamole when you toss the salad!
Make Ahead Strategy: When we make this for studio lunches, I prep the greens and dressing separately. I slice the avocado at the very last second to keep it fresh and green.