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Preparation
In Dutch oven or large saucepan (4 qt), melt butter over medium heat; cook onion, stirring often, for about 7 minutes or until softened but not browned.
Add flour; cook, stirring constantly, for 2 minutes.
Slowly add broth, stirring constantly; bring to boil.
Add broccoli, garlic, salt and pepper; simmer, partially covered, for 15 minutes or until broccoli is very tender.
Purée soup with Cheddar and Parmesan cheeses, in batches, using blender or immersion blender until very smooth.
Return to saucepan; stir in cream.
Heat until simmering but not boiling.
Garnish with pancetta (if using).