Put the shrimp in a small bowl and add 1/2 of the jalapeno, 2 teaspoons lemon oil, and salt and pepper, to taste, and toss to combine. In a second bowl, mix the tomatoes with 2 teaspoons oil and salt and pepper, to taste. Put the diced avocado in a third bowl, add the remaining 2 teaspoons lemon oil, remaining 1/2 of the jalapeno, salt and pepper, to taste, and toss well.

To assemble, divide 3/4 of the shrimp among 4 short 6-ounce wide-rimmed glasses. Top the shrimp in each glass with 1/4 of the tomatoes, followed by 1/4 of the avocado. Finely chop the remaining shrimp to garnish each glass and sprinkle the chives evenly over each salad. Alternately, you can layer this salad in a large glass trifle bowl, to share. Serve immediately or chill and serve within 1 hour.