1/2 cup cold water
2 envelopes plain gelatin
1 cup water
1/2 cup champagne vinegar or white vinegar
1 cup granulated sugar
1 tsp. kosher salt
3 cups peeled and seeded cucumber, cut into 1/4-inch pieces
1/2 cup thinly sliced green onions, white and green parts
1/2 cup celery, cut into 1/4-inch pieces
Vegetable oil or cooking spray
Directions
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In bowl pour 1/2 cup cold water. Sprinkle the unflavored gelatin over to soften, about 10 minutes.
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In a non-reactive saucepan, combine 1 cup water, the vinegar, sugar, and salt. Cook and stir over medium heat until hot and sugar is dissolved. Remove from heat; add softened gelatin mixture, stirring until dissolved. Transfer to large bowl.
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Place bowl over very large bowl of ice water. Stir occasionally until completely cold and just beginning to thicken, about 10 minutes.
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Stir cucumbers, green onion, and celery into cold mixture. Pour into a 6- to 8-cup non-reactive mold or dish that has been lightly oiled. Wrap mold with plastic wrap; refrigerate 4 hours or overnight.
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To unmold, dip mold briefly (10 seconds or less) into very hot water. Invert mold onto a serving dish. Makes 8 servings.