While your pan heats, prepare all your salad components to ensure everything comes together smoothly. Wash and chop your mixed greens, cut tomatoes into 1-inch wedges, peel and slice cucumbers into 1/2-inch half-moons, and finely mince your shallot and garlic. Chop your fresh herbs (parsley and chives) and set aside. Having everything prepped and ready will make assembly seamless once your protein is cooked.
In a small bowl, combine 3 teaspoons cajun seasoning, smoked paprika, and 1/4 teaspoon salt. Toss the shrimp with this seasoning mixture until evenly coated. Heat 2 tablespoons olive oil in a large skillet over medium-high heat until it shimmers, then add the shrimp in a single layer. Cook for 2-3 minutes until the bottom is golden and they begin to curl, then flip and cook for another minute until just cooked through. Transfer to a plate—the shrimp will continue cooking slightly as it rests.
Using the same skillet (no need to clean it—those browned bits add flavor), add 1 tablespoon olive oil and the sliced andouille. Cook for about 7 minutes, stirring occasionally, until the sausage is heated through and edges begin to caramelize. Add your minced shallot and the remaining 1/2 teaspoon cajun seasoning, stirring constantly for 2 minutes to soften the shallot and bloom the spices. I like to let the shallots get slightly golden here—it brings out their natural sweetness and deepens the dressing flavor.
Add the sherry vinegar to the skillet and use a wooden spoon to scrape up all the flavorful browned bits from the bottom—this is called deglazing and it adds incredible depth to your dressing. Remove from heat and whisk in the water, honey, and mustard until smooth and combined. The dressing should have a beautiful balance of tangy vinegar, subtle sweetness, and sharp mustard bite. Taste and adjust if needed, though the seasoning from the sausage and shallots should provide plenty of flavor.
Place your mixed greens in a large serving bowl and add the tomatoes, cucumbers, fresh herbs, lemon juice, 1.5 tablespoons olive oil, and 1/4 teaspoon salt. Toss gently to coat everything evenly. Top the dressed greens with the cooked shrimp and andouille mixture from Step 3, pouring all the warm vinaigrette over the top. The warmth of the dressing will gently wilt the greens while keeping them fresh and crisp, and it creates a beautiful contrast with the cool vegetables.