"This recipe is not tested for hot water bath canning, but it can be pressure canned or frozen in ziploc bags for up to a year....."
INGREDIENTS
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4 tablespoons olive oil
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2-3 medium yellow onions, sliced into rings
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2 large carrots, roughly chopped
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1 celery stalk, roughly chopped
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6 pounds (3k) plum tomatoes, quartered
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6-8 fresh basil leaves
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potato masher
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immersion blender
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6 - 1 pint (500ml) glass jars and lids, freshly dish-washed
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wide-mouth funnel (optional)