Preheat oven to 375°F.
Chop Broccolini® (including stems) in thirds with a result of 6 cups of chopped Broccolini® then season with 2 tablespoons olive oil, za’atar, and salt.
Place Broccolini® on baking sheet with ¼ cup water. Roast Broccolini® in oven until florets start to brown and stems begin to soften, about 12-15 minutes. Set aside and allow Broccolini® to cool to room temperature.
In a food processor, combine chopped Broccolini® and remaining ingredients (except olive oil) and blend until mostly smooth. Stop and scrape down sides, blend again and slowly stream in about 2 tablespoons olive oil.
Taste and season with salt and more lemon juice as needed.
Drizzle with a bit of olive oil to serve.