Slice the broccoli into florets of even sizes and arrange across a shallow oven tray. Thinly slice the garlic and scatter over the broccoli along with the lemon zest, salt and pepper. Drizzle with the olive oil and lemon juice.
Step 3
Transfer to the oven to bake for 18-20 minutes, turning halfway through until fork tender and golden at the edges.
Step 4
Toss the broccoli with the watercress sauce to serve.