1
Adjust rack to top position and preheat oven to 425 degrees. Bring a large pot of salted water to a boil. Wash and dry all produce.
Halve, peel, and dice onion. Peel and thinly slice garlic. Dice tomato. Zest and quarter lemon. Pick basil leaves from stems; roughly chop leaves. Cut broccoli florets into bite-size pieces if necessary.