01 - Preheat oven to 400°F. Line a rimmed baking sheet with parchment paper and set aside.
02 - In a mixing bowl, combine the ricotta cheese, lemon zest, lemon juice, chopped basil, minced garlic, grated Parmesan, and a generous pinch of salt and pepper. Stir until smooth and well blended.
03 - Bring a pot of salted water to a rolling boil. Add the trimmed asparagus spears and blanch for 2 minutes until bright green and crisp-tender. Immediately transfer to an ice water bath to halt cooking. Drain thoroughly and pat dry.
04 - Lay each salmon fillet flat, skin side down. Spread one quarter of the ricotta mixture along one short edge of each fillet. Lay 4 asparagus spears lengthwise on top of the filling. Roll each fillet tightly around the asparagus and ricotta filling, starting from the edge with the filling. Secure the rolls with kitchen twine or toothpicks if needed to hold their shape.
05 - Place the salmon rolls seam side down on the prepared baking sheet. Brush the tops and sides with olive oil and season lightly with salt and pepper.
06 - Bake on the center rack for 18 to 20 minutes, until the salmon is cooked through and flakes easily when tested with a fork.
07 - Remove the rolls from the oven and discard any toothpicks or twine. Transfer to warmed plates, garnish with fresh basil leaves, and serve immediately with lemon wedges alongside.