Step 1

Bring a large pot of salted water to a boil.

Step 2

Heat the olive oil and 2 tablespoons butter in a large pot over medium heat. Add the onion, garlic, rosemary and pepper flakes, then cook, stirring, until fragrant, about 3 minutes.

Step 3

Meanwhile, drop the pasta into the boiling water and cook for a couple minutes under the recommended time.

Step 4

Add the tomato paste and cauliflower to the onions, then stir to combine. Continue to cook, stirring, until the cauliflower begins to caramelize and the tomato paste has cooked down, 6 to 7 minutes.

Step 5

Drain the pasta, reserving 1 cup of the pasta water. Add the pasta, pasta water, pecorino and remaining 2 tablespoons butter to the pot with the sauce. Stir and toss until totally combined.

Step 6

Add the cream and season to taste. Serve topped with fresh basil and a little more pecorino.