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STIR boiling water into combined dry gelatin and salt in large bowl at least 2 min. until completely dissolved. Stir in cold water and lemon juice. Refrigerate 1-1/2 hours or until thickened (spoon drawn through leaves definite impression).
STIR in vegetables. Spoon into 5-cup mold sprayed with cooking spray.
REFRIGERATE 4 hours or until firm. Unmold. Store leftover gelatin in refrigerator.