To make the sauce, cut a small cross in the bottom of each tomato, then cut out and discard the stem bases. Place the tomatoes in a large mixing bowl. Pour over enough just-boiled water to cover and leave for 1 minute. Pour the water away and unrobe the loose skins from the flesh.
Chop the tomatoes in no particular fashion other than smallish. Put the oil in a large, shallow ovenproof c