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Preheat the oven to 200 degrees celsius (180 fan forced).
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Cut the pumpkin into large pieces (and remove the seeds and skin) and place onto a large flat baking tray (approximately 30cm X 40cm) along with the quartered onion.
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Drizzle with olive oil and season with salt and pepper. Bake for 35-40 minutes or until the pumpkin is soft.
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Place the pumpkin and onion into a saucepan and allow to cool slightly.
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Add 1 cup of vegetable stock liquid and blend with a stick blender (a normal blender or a Thermomix can be used in place of the stick blender).
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Add the remaining 2 cups, one at a time, blending in between each addition.
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Add the evaporated skim milk and gently stir through.
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Bring the soup in a saucepan to a low simmer until heated through.