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1
Cook shallots and celery in olive oil in a 4-quart heavy pot over moderate heat, stirring occasionally, until softened, about 10 minutes. Add pureed tomatoes, sugar, salt, pepper, and celery seeds and simmer, partially covered, stirring occasionally, 25 minutes. Pour tomato mixture through a sieve lined with dampened cheesecloth into a clean 3-quart saucepan, pressing hard on solids to extract as much liquid as possible. Discard solids. Bring tomato broth just to a boil, then remove from heat and stir in Worcestershire sauce.
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2
While tomato broth comes to a boil, stir together lemon juice and vodka in a small bowl. Sprinkle gelatin over vodka mixture. (Spoon vodka mixture over any powdered gelatin remaining on top.) Let stand until softened, about 5 minutes.
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3
Lightly oil a 1 1/2- to 2-quart nonreactive shallow baking pan (2 inches deep).
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4
Add gelatin mixture to hot tomato broth, stirring until gelatin is dissolved. Pour into baking pan and chill, uncovered, until firm, at least 6 hours.
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5
To unmold aspic, run a small sharp knife around edge, then dip baking pan into a larger pan of warm water, 15 to 20 seconds. Put a cutting board over baking pan, then carefully invert aspic onto board and cut into 1/2-inch cubes.
