Cook leeks and onion in butter until tender, but
not brown. Add potatoes, broth and salt. Cook, covered 35 to 40 minutes.
Rub through fine sieve; return to heat, add milk and light cream.
Season to taste. Bring to boiling. Cool; rub through very fine sieve.
When cold, add whipping cream. Chill before serving. Garnish with
snipped chives. Makes 10 servings.
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