Stir together the pesto sauce and lemon juice in a small bowl to make the dressing. Set aside until ready to use.: The aroma should be bright and herbal right away, with the lemon lifting the basil notes from the pesto sauce . Use a small whisk or fork and beat until the oils loosen and the mixture looks glossy, this tells you the dressing will coat leaves smoothly. You'll notice a fragrant, citrusy scent that indicates balance. If the dressing feels too thick, add a teaspoon of water at a time until it pours. Common mistakes include adding too much lemon up front which can overpower the pesto sauce , so taste as you go.
Heat your grill to medium-high and spray with oil.: As the grill comes up to temperature you should hear a faint hum and smell a slight warm metal note; when a droplet of water dances and evaporates, it's ready. Oiling the grates prevents sticking and helps create those appealing char lines on both shrimp and asparagus . If you are using a stovetop grill pan, preheat it until it is hot enough that a small pinch of salt sizzles on contact. One pitfall is grilling at too low a temperature which leads to steaming rather than searing, producing pale and limp results.
Lightly coat shrimp and asparagus with olive oil and sprinkle with salt and pepper.: You should feel the oil create a thin sheen when you toss the items, this encourages even browning and prevents sticking. The salt draws out flavor from the shrimp and enhances the vegetal sweetness of asparagus . I usually do this in a shallow bowl so everything gets an even coating. Avoid over-oiling which can cause flare ups and greasy texture.
Place the shrimp and asparagus on the grill (you may need to do so in batches depending on the size of your grill). Grill, flipping once or twice until shrimp is cooked through and asparagus is bright green and soft, but still al dente.: You will hear light sizzling and smell a buttery, toasted aroma as the grill kisses the surfaces. Watch for the shrimp to turn opaque and curl into a neat C shape, and for the asparagus to take on flecks of char while remaining springy to the bite. This technique seals in juices for the shrimp and concentrates sweetness in the asparagus . Overcooking is the main error here; shrimp become rubbery and asparagus mushy if left too long.
Transfer shrimp and asparagus to a plate and allow to cool slightly. Chop the asparagus into 2-inch pieces.: As they relax off the heat you'll notice a gentle steam and the aromas will mellow, which makes handling safer. Letting them rest a few minutes preserves juiciness in the shrimp , and chopping the asparagus into uniform 2 inch pieces ensures each forkful has a balanced texture. If you chop while piping hot you risk wilting the greens later. A common oversight is skipping the brief rest which can leave juices running into the salad and making it soggy.
Add the spring greens to a large serving bowl. Add the lemon-pesto dressing, grilled shrimp, asparagus, avocado, pine nuts, and toss everything together.: When you pour the glossy dressing over the greens, you should see it lightly coat leaves rather than pool at the bottom; this is the correct ratio. Tucking in warm shrimp helps carry flavor into the leaves, and the creamy avocado will soften slightly, binding with the oil for a silky mouthfeel. Toss gently so the leaves retain their structure and the toasted pine nuts remain crunchy. Overmixing can bruise the greens and cause limpness, so fold carefully.
Serve and enjoy!: The final plate should look vibrant, with glossy dressing, charred streaks on the asparagus , and a scatter of golden pine nuts . You will notice a range of temperatures and textures that make every bite satisfying. Serve immediately while the shrimp retains warmth; leftovers are still tasty but lose some of the immediate contrast between warm and cool components. A frequent mistake is letting the salad sit too long before eating, which dulls the flavors and softens the greens.