Preheat oven to 425°. In a medium bowl, toss broccoli, fennel, olive oil, lemon juice, salt and pepper. Place on a large baking sheet in a single layer. Roast 15 minutes, until vegetables begin to brown.
If using raw dough, roll out thinly and place on a baking sheet. Prebake 10 minutes before adding toppings.
Spread sauce over crust. Add roasted vegetables, and top with mozzarella and olives.
Bake 7–9 minutes, until cheese is bubbling.
Sprinkle with red pepper flakes to taste.
Tip: Any classic red sauce will complement this pizza.