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 and herbs.
03 - In a small bowl, whisk together olive oil, lemon juice, Dijon mustard, minced garlic, salt, and pepper until well blended and emulsified.
04 - Pour the dressing over the shrimp and vegetables, and toss gently to combine evenly without mashing the avocado.
05 - Chill for 10 minutes before serving for enhanced flavor integration, then serve immediately garnished with extra dill sprigs or lemon wedges.