Warm pasta, broccoli & bean salad with lemon, garlic and basil

Name: Warm pasta, broccoli & bean salad with lemon, garlic and basil
Prep time: 10 min
Cook time: 20 min
Total time: 30 min
Cuisine: Italian
Ingredients: A splash of water / stock; 350g wholemeal pasta – rigatoni, penne etc; 1 smallish red onion, halved, then finely sliced; 2 large garlic cloves, finely chopped or microplaned; ½ tsp fine sea salt; 1 can / 250g cooked cannellini beans; 1 heaped tsp freshly grated / microplaned lemon zest; 2 tablespoons lemon juice; 6 medium tomatoes, cored and chopped; 1 large head of broccoli, cut into small florets; Large bunch of basil, finely shredded; 1 tablespoon balsamic vinegar; A dozen or so Kalamata olives, to serve