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Melt the butter in a Dutch oven or large saucepan over medium-low heat; add the chopped green onion and celery. Saute, stirring, until tender.
Blend the flour into the butter and vegetables until well incorporated. Continue cooking, stirring, for about 2 minutes.
Slowly stir in the warmed milk and continue cooking and stirring until thickened.
Add the freshly ground black pepper, tomato paste, and heavy cream.
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