Preheat oven to 200 C (180 fan forced).
In a shallow bowl, combine lemon juice and oil. Add fish fillets; turn to coat.
Place in a greased 9-in. pie plate. Sprinkle with half each of the basil, salt, and pepper.
Arrange tomatoes over top; sprinkle with cheese and remaining seasonings.
Cover and bake until fish flakes easily with a fork, 10-12 minutes.
For the marinated broccoli, in a jar with a tight-fitting lid, combine the first 8 ingredients; shake well.
In a small bowl, combine broccoli and red capsicum; add dressing and toss to coat.
Cover and refrigerate for at least 1 hour. Serve with a slotted spoon.
