Combine the peeled, thawed shrimp in a bowl with a few tablespoons of olive oil, lemon juice and the spices.
Toss to coat then allow to marinate for 10 minutes while you preheat the pan.
Preheat a large grill pan (you can use a skillet or outdoor grill too) over medium-high heat then cook the shrimp for 1-2 minutes per side (depending on their size) until golden brown and cooked through.
Remove from the heat and allow to rest while you make the salad.
Add the lettuce, halved cherry tomatoes, sliced cucumbers and chunks of avocado to a large salad bowl then add the shrimp.
Mix together the dressing ingredients then pour over the salad and serve.