10 pickling cucumbers or 3 medium cucumbers, thinly sliced
1 tablespoon plus 1 teaspoon salt, divided
2 cups white vinegar
1 cup sugar
1/2 cup lemon juice
3 teaspoons celery seed
1 teaspoon pepper
2 medium onions, halved and thinly sliced
Place cucumbers in a colander over a plate; sprinkle with 1 tablespoon salt and toss. Let stand 30 minutes. Drain.
In a small bowl, whisk vinegar, sugar, lemon juice, celery seed, pepper and remaining salt until blended. In a large bowl, combine cucumbers and onions. Pour dressing over cucumber mixture; toss to coat. Refrigerate, covered, at least 2 hours before serving.