Step 1Combine tomato, chilli flakes, lemon juice and half of the olive oil in a bowl to make dressing. Season with cracked black pepper and set aside for 5–10 minutes to let flavours develop.
Step 2Meanwhile, combine remaining olive oil, prawns and half of the garlic in a bowl. Combine and set aside for 5 minutes. Spray a large non-stick frying pan with olive oil and set over high heat. Cook prawns, in 2 batches, for 2–3 minutes, or until golden and just cooked through. Set aside.
Step 3Return same pan to a medium heat and spray with olive oil. Sauté onion for 5 minutes, or until softened. Add remaining garlic and cook, stirring, for 30 seconds, or until fragrant. Add beans and cook, stirring, for 1–2 minutes, or until warmed through. Return prawns to pan and stir to combine.
Step 4Meanwhile, combine rocket, cherry tomatoes and fennel on a large plate. Top with garlic prawns and warm beans, drizzle with the tomato dressing and serve.