Pre-heat the oven to 180ºC
Prepare the vegetables as detailed above and place in an oven-proof dish or baking tin. Pop in the oven and roast for 20 minutes, stirring once to spread the juices out.
Once the veggies are soft, remove from the oven and leave to cool.
Take the skin off the roasted garlic cloves and place them and the rest of the dish into the bowl of a food processor or high-speed blender. Blend to smooth.
Season with salt and pepper and add a little olive oil if you desire.
Keep in the fridge until ready to use. Or freeze in bags or freezer pots.