Classic Coleslaw

1 small head green cabbage, cored and sliced as thinly as possible
1 small head red cabbage, cored and sliced as thinly as possible
4 celery stalks, finely chopped
4 scallions (green onions, spring onions), green and white parts, finely chopped
4 carrots, shredded
1 cup mayonnaise
3 Tbs fresh lemon juice
2 Tbs caraway seeds (optional)
1 Tbs celery seed (optional)
Salt and freshly ground pepper to taste

Place the cabbage in a large bowl and cover with ice water. Refrigerate for at least 1 hour and drain thoroughly. Combine the cabbage, celery, scallions, and carrots in a large bowl. Mix together the remaining ingredients in a separate bowl and pour over the cabbage mixture. Toss to combine well and refrigerate for at least 1 hour before serving. Serves 6 to 8.