Cook the cauliflower in a large pot of boiling water over medium heat until very tender (approximately 20-25 minutes). Take the pot off the heat. Remove the cauliflower with a slotted spoon and transfer to a large bowl.
Place the pot with cauliflower infused water on high heat and bring to the boil (add more water, if required). Add a pinch of salt and penne pasta to the boiling water and cook until ‘al dente’ – refer to the cooking time specified in pasta packet instructions. Drain the pasta.
Heat the olive oil in a large frying pan over medium heat. Add the garlic and chilli. Cook for 2 minutes or until aromatic. Stir in cauliflower and cook for 2 minutes, then season to taste. Remove from the heat. Add the pasta and olives and toss to combine.
Serve with grated Parmigiano Reggiano on top.
1 cauliflower, cut into small florets|400g penne pasta|5 tablespoons (100ml) extra virgin olive oil, plus extra to serve|2 cloves garlic, crushed|3 small red chillies, finely chopped|16 kalamata olives, pitted and halved|Parmigiano Reggiano to serve|Sea salt