Start by boiling salted water, then cook the capellini according to package instructions until al dente.

While the pasta cooks, whisk together fresh lemon juice, olive oil, salt, and pepper in a bowl until emulsified.

Once the pasta is done, drain and rinse it under cold water to stop the cooking process, then add it to the lemon dressing.

Toss in arugula and halved cherry tomatoes just before serving to keep everything fresh.