- 2 pounds medium shrimp (about 76), peeled and deveined
- 3/4 cup white-wine vinegar
- 1 cup vegetable oil
- 1/4 cup capers, not drained
- 1 teaspoon salt
- 1 teaspoon black pepper
- 1 teaspoon celery seeds
- 1/2 teaspoon Tabasco
- 1 cup thinly sliced onion
- 1/2 cup chopped celery
- 7 bay leaves (not California)
- 2 firm-ripe California avocados
- Accompaniment: soft green-leaf lettuce such as Boston
- Cook shrimp in a 5-quart pot of boiling salted water until just cooked through, 2 to 3 minutes, then drain in a colander.
- Whisk together vinegar, oil, capers, salt, pepper, celery seeds, and Tabasco in a large bowl, then add warm shrimp, onion, celery, and bay leaves and toss to combine. Marinate, covered and chilled, 24 hours to 2 days.
- Just before serving, discard bay leaves. Quarter, pit, and peel avocados and cut into 3/4-inch cubes. Gently stir into shrimp salad, then spoon over lettuce.
- When salting water for cooking, use 1 tablespoon salt for every 4 quarts water.