Trim the cauliflower and coarsely chop. Place the chopped cauliflower in your food processor and process, in a few batches if needed, until it has the texture of rice. You should have about 1 lb. of riced cauliflower.
In a large skillet, heat the oil over medium-high heat, about 2 minutes.
Add the cauliflower, salt and pepper. Cook, stirring constantly, until almost tender, about 4 minutes.
Add the garlic and cook, stirring, until tender, 1 more minute.