1. Lightly trim any brown leaves from the cauliflower.
Keep the rest of them on; they’re actually delicious. Cut the cauliflower into quarters to make four wedges.
2. Place cauliflower in the slow cooker with cut edges facing upward.
Drizzle with olive oil, then season with salt and pepper.
3. Evenly spread tomatoes around the cauliflower.
4. Cover and cook on high for 3 hours.
5. Gently remove the cauliflower wedges from the slow cooker and put them on a serving dish.
Add the basil to the slow cooker and mix with tomatoes.
Spoon tomato mixture over cauliflower wedges and serve.
