01 - In a large salad bowl, combine the sliced cucumber, red onion, cherry tomatoes, avocado, dill, and parsley.
02 - Add the cooked shrimp to the bowl with the vegetables.
03 - In a small bowl, whisk together olive oil, lemon juice, Dijon mustard, minced garlic, salt, and pepper until well blended.
04 - Pour the dressing over the shrimp and vegetables, and toss gently to combine.
05 - Chill for 10 minutes before serving for extra flavor, if desired. Serve immediately, garnished with extra dill or lemon wedges.