1/2 cup parmigiano reggiano (parmesan cheese), grated
Brush the fish with the oil, sprinkle on the lemon zest, pepper, salt and dill and place on a large baking sheet.
Toss the asparagus in the oil, alt and pepper and arrange in a single layer on the same baking dish as the fish along with the tomatoes and sprinkle the cheese over everything.
Roast in a preheated 400F/200C oven (or barbecue) until just cooked, about 10-15 minutes before serving with a sprinkle of the lemon juice.