Preheat oven to 220℃/428℉.
On a tray lined with baking paper, coat sweet potato with olive oil and spinkle with cumin. Roast for 30-40 minutes, or until softly pleasant, turning over every 10 minutes to avoid burning at the corners.
Sprinkle zucchini with olive oil, salt, pepper and dry herbs and roast for approximately 20 minutes until just starting to brown. The outside will be crunchy and the inside tender.
While zucchini and potato are roasting, boil beans (add 1 teaspoon of sugar to water, it makes a difference when boiling greens), until tender but crunchy, approximately 3 minutes.
Put rocket on serving plate and top with sweet potato, zucchini and beans. Use oil leftover from roasting potato and zucchini as the dressing for the rocket and beans.
Season to taste. Add optional topping if desired.