In a small bowl, whisk your pesto sauce together with the lemon zest and juice.
Season with sea salt and pepper to your taste. Set aside.
Heat your oil in a large skillet over medium heat.
Cook the shrimp until pink and opaque and slightly charred, for about 4 minutes total.
Season lightly with sea salt and pepper, and set aside to cool.
In a large bowl, add the lettuce, red onion, tomatoes, and cooked quinoa.
Drizzle everything with your pesto-lemon mixture and toss well to combine.
Divide this salad/quinoa mixture equally among four serving bowls then top each with your charred shrimp and avocado.