In large pot, saute vegetables in oil till tender, about 5 - 8 minutes. Add peas, seasoning and stock. Heat to boiling, reduce heat to simmer. Cover and simmer just till peas are soft, about 30 minutes. Pour into blender and blend till smooth. Blend sour cream, horseradish, and sugar. Top serving with a dollop of horseradish cream.
Be careful when blending hot peas. I only fill my blender half full and blend on low. Otherwise, it may explode out.
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