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In a large bowl soak peas overnight in enough cold
water to cover
by 2 inches and drain.
In a 7 1/2-quart heavy kettle combine leeks, water,
peas, ham hock,
and thyme and simmer mixture, uncovered, until
peas are very tender,
about 30 minutes. In a blender puree 4 cups soup
in batches and
return to kettle. Peel celery root and cut into
1/4-inch dice. Add
celery root to soup and simmer, stirring occasionally,
20 minutes.
Add carrots and simmer, stirring occasionally,
until tender, about
15 minutes.
Remove meat from ham hock and discard skin and
bones. Chop meat
coarse and stir into soup with salt and pepper
to taste. Soup may
be made 3 days in advance. Cool soup uncovered
and keep covered and
chilled. Thin soup with water if too thick.