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Heat the aromatics: Preheat oven to 165°C. In a large Dutch oven over medium heat, warm the olive oil and melt the butter. Add the minced garlic and cook for about 2 minutes until fragrant, but not browned.
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2. Bloom the spices: Add the chilli flakes and dried oregano. Stir for 30 to 60 seconds until the herbs smell toasty.
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3. Add tomatoes and veg: Pour in the canned whole peeled tomatoes (with their juices). Add the carrot chunks, onion halves, and basil stem. Season lightly with salt and black pepper.
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4. Break up tomatoes: Stir well, then use a wooden spoon or potato masher to break the tomatoes into smaller pieces. No need to hand-crush, just get them roughly broken up.
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5. Oven simmer: Bring the pot to a gentle simmer on the stovetop. Cover with the lid slightly ajar, then transfer to the oven. Cook 5 to 6 hours, stirring every 1 to 2 hours, until reduced by about half and deep red.
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6. Finish: Remove from oven. Remove and discard the basil stem. Blend the sauce until smooth (optional) or leave it rustic. Taste and season more aggressively with salt and pepper.
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7. Stir in basil: Finely chop the basil leaves and stir them through.
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8. Portion and freeze: Cool completely. Freeze in single-cube portions (1 cup each) until solid, then transfer to labelled freezer bags.