Preheat your oven to 325°F.
Put tomatoes into a 9” by 13” baking dish. Add onions, garlic, olives, thyme, salt and pepper and cover with oil. Toss well and place in the oven to roast slowly for 1 hour or so. The sauce is done when it begins to brown here and there, the tomatoes shrink and it smells amazing.
Toss with your favourite pasta.
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