Steam expands quickly in a blender, and can cause ingredients to splatter everywhere or cause burns. To prevent this, fill the blender only one-third of the way up, vent the top, and cover with a folded kitchen towel while blending.

Heat the soup though - avoid boiling it - and serve immediately.

Carefully transfer the hot broccoli mixture back into the saucepan and stir in the heavy cream, salt, pepper, and nutmeg.

Using a blender, puree the broccoli soup until it is smooth.

Reduce the heat to low, and simmer the soup for 8 to 10 minutes, until the broccoli is tender.

Add the chicken stock and broccoli and bring the mixture to a boil.

In a large saucepan set over medium heat, sauté the chopped onion in butter just until it turns translucent and tender.

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