Add the olive oil to a large pan over medium to high heat. When hot, add in enough zucchini slices so a single layer covers the pan. Cook until the bottom side is golden brown, then turn the slices over and again cook until golden. Remove the zucchini from the pan and do the same with the remaining slices. Add an extra splash of olive oil if needed. When both sides are nearly golden on the second batch, add garlic and cook for a further minute. Add the first lot back to the pan and season with salt and pepper. Add the red wine vinegar and herbs if you’re using them, to the pan before serving.