Bring a large pot of water to a boil. Add the pasta, a generous pinch of salt, and stir to separate the pasta. Cook according to package directions until just cooked through, being careful not to overcook, stirring occasionally. Drain, rinse, and add to a large bowl.
Meanwhile, make the dressing by whisking together the vinegar or lemon juice, oil, maple syrup, salt, and pepper in a medium bowl until well combined.
Pour the dressing over the warm pasta, tossing to coat. It’s okay if some dressing is left in the bottom of the bowl, the pasta will absorb it as it sits.
Add the veggies, olives, and green onion, tossing to combine. Taste and add additional salt and pepper if desired.
Serve immediately, or refrigerate, covered, for up to 1-3 days. Allow to come to room temperature before serving.*