Freshly grated parmesan cheese, for serving (optional)
Method
Preheat the oven to 425°F with a rack in the center position.
Add the cauliflower rice, tomatoes, and sausage to a large rimmed baking sheet. Toss with the pesto, salt, and pepper, then spread out into an even layer.
Roast for about 30 minutes, or until sausage is browned and the tomatoes just start to blister. Remove from the oven, add the arugula and basil and toss to combine.
Divide among 6 plates and top with parmesan, if using.