In a blender, combine basil leaves, pine nuts, Parmesan cheese, and garlic. Blend until finely chopped.

With the blender running, slowly add olive oil until the mixture is smooth. Season with salt and pepper to taste.

In a large mixing bowl, combine mixed greens, cherry tomatoes, cucumber, and red onion.

Add the pesto and toss gently until the salad is well coated.

Serve immediately, garnished with additional Parmesan if desired.