The goat cheese mixture can be made 1 day in advance. Assemble the appetizer on a platter, cover, and chill up to 4 hours ahead of party.
Process first 4 ingredients in a food processor until smooth. Spoon into a small bowl; stir in cilantro and next 3 ingredients.
Pipe or spoon about 1 1/2 teaspoons cheese mixture onto each tip of endive leaf, top with 1 tomato slice. Garnish, if desired. Serve immediately, or cover and chill up to 4 hours.
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