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Preheat oven to 220°C (fan 200°C).
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2. PREP: Toss all vegetables with olive oil, salt, pepper, oregano, smoked paprika, and garlic until evenly coated.
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3. SPREAD: Arrange vegetables across two large trays. Do not overcrowd (this is critical for browning, not steaming).
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4. ROAST PART 1: Roast for 20 minutes.
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5. FLIP: Remove trays, flip and stir vegetables, then return to oven.
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6. ROAST PART 2: Roast another 15 to 20 minutes until deeply caramelised and slightly charred at edges.
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7. COOL: Let cool completely, at least 30 minutes.
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8. PORTION: Spoon into ½-cup Souper Cubes. Press down lightly to remove air pockets.
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9. FREEZE: Freeze until solid, then transfer to labelled freezer bags.