First, bring a large pot of water to a boil. In a serving bowl, add the lemon juice, 1 tablespoon of the olive oil, salt and pepper. Whisk to combine. Set aside.When the pasta is boiling, add a handful of salt and the orzo pasta. Cook the orzo according to the package directions. Drain and add to bowl. .

Meanwhile, chop the veggies into large chunks for the grill: slice the pepper in quarters, slice the squashes in half length-wise, and slice the onion into 2 or 3 slabs.

Preheat a grill over high heat. Drizzle olive oil in the pan, and then arrange the veggies in the pan. Cook for 5 minutes, check for grill marks and flip, and then cook on the second side until more grill marks form. Remove the veggies from the grill and let cool slightly.