Instructions: In a casserole over medium heat, melt butter. Add onion, celery, cucumber, salt, and pepper and sweat until translucent. Add stock and bring to the boil. Reduce to a simmer and cook for 45 minutes. Add sorrel and cook for an additional 5 to 6 minutes. Blend mixture with an immersion blender until smooth and allow to cool before refrigerating. Chill for 2 hours.

Blend in yogurt and season with salt and pepper. Serve each bowl with a generous dollop of caviar.

This recipe yields 4 servings.

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