Prepare the vegetables: Wash and dry the cucumber, tomato, red onion, and basil. Slice the cucumber into thin half-moons, cut the tomato into bite-sized pieces, and thinly slice the red onion.
Combine the salad: Place the cucumber, tomato, red onion, and fresh basil in a large serving bowl.
Make the dressing: In a small bowl, whisk together the olive oil, lemon juice, and Italian seasoning until well combined.
Dress the salad: Pour the dressing over the vegetables and gently toss until everything is evenly coated.
Toast the pine nuts: Place the pine nuts in a dry skillet over low heat. Toast for a few minutes, stirring frequently, until lightly golden and fragrant.
Finish and serve: Sprinkle the warm toasted pine nuts over the salad just before serving. Serve immediately or chill briefly before enjoying.