Start by preparing the vegetables. You can do this ahead of time and pop them in the fridge for later if you wish. Crush, or chop the garlic finely. Peel and chop the onion. Slice or chop the red pepper. Top and tail the courgettes and cut into chunks (no need to peel).
When you are ready to start cooking, turn the oven on to warm up to 350 degrees F, 180 degrees C or gas mark 4.
Heat the olive oil in a deep frying pan, or a flameproof casserole dish, on the stove top. Add the garlic, onion and red pepper and cook gently for 2-3 minutes.