1Bring a 6-qt. pot of salted water to a boil, pat the shrimp dry with paper towel and remove shells from the tail.
2Put the shrimp in boiling water and cook for 2-3 minutes or until opaque. While the shrimp are cooking grab a medium bowl and fill it with cold water and ice. Once the shrimp are cooked, drain and place the shrimp in the ice water to prevent them from cooking any longer. Once cooled, drain and pat dry. Transfer to a cutting board, and cut into bite-sized pieces.
3Thinly slice celery, and chives and cut your lemon in half.
4In a bowl, combine the mayo, ½ the lemon juice, ½ the chives, ½ the celery, ½ the spices, and S&P. Add the shrimp; toss well.
5In a second bowl, combine the remaining lemon juice, chives, and spices, 2 tbsp. oil (double for 4 portions) and S&P. Add the tomatoes, ⅔ of the baby greens, and the remaining celery; toss well.
6Divide the toasted buns and salad between plates. Top each bun with the remaining baby greens, shrimp filling, and your bun top.