1 cup cider vinegar
1 cup water
1/4 cup sugar
2 teaspoons salt
1 teaspoon mustard seeds
1 teaspoon turmeric
1/2 teaspoon crushed red pepper
8 fresh dill sprigs
3 garlic cloves, peeled
3 medium zucchini (about 1 1/2 pounds), thinly sliced lengthwise
1 cup thinly sliced onion
1. Combine first 9 ingredients in a medium saucepan; bring to a boil. Reduce heat, and simmer, uncovered, 15 minutes.
2. Combine zucchini and onion in a large bowl; pour hot vinegar mixture over vegetables. Cover and let stand at room temperature 3 hours. Chill 8 hours before serving.