Preheat the oven to 200C/400F degrees.
Cut the cauliflower into 4 large slices, and put aside any florets that will break loose and chop them finely. (use them for pizza bites)
Mix the olives, 1 garlic clove, sun-dried tomatoes, 1 tablespoon olive oil, basil and lemon juice. Season with salt and pepper.
Heat the remaining olive oil in a large frying pan.
Brush the cauliflower steaks with olive oil and season with the oregano, salt and pepper.
Place the cauliflower slices, 3 garlic cloves and plum tomatoes onto a baking sheet lined tray and bake for 25 minutes.
Remove from the oven, set the cauliflower slices aside. Place the roasted garlic and tomatoes into a blender and blitz until smooth. Season with salt & pepper
Spoon the tomato sauce on a plate and place the cauliflower slice on top.
Add the olive and sun-dried tomato mix to the plate and serve with chopped basil (optional)