Start by boiling a large pot of water over high heat. Once it reaches a rolling boil, add the spaghetti and cook according to package instructions until al dente, about 8-10 minutes. Drain and rinse under cold water to cool.

In a large mixing bowl, combine the cooled spaghetti, baby spinach, oranges, pepitas, and sesame seeds. Toss gently until evenly mixed.

In a small bowl or mason jar, mix the olive oil, sesame oil, orange juice, rice vinegar, garlic, sugar, and soy sauce. Whisk or shake until smooth.

Pour the dressing over the salad mixture and toss to coat well.

Serve immediately or refrigerate for up to 1 day, keeping dressing separate until serving.