1Bring a medium pot of water to a boil and generously salt it.
2Cook the orzo until al dente according to the package instructions. Drain and transfer to a large mixing bowl to cool slightly.
3Heat a grill pan or griddle over medium heat. Add the corn directly to the surface and grill for 10–12 mins, turning occasionally with tongs until lightly charred on all sides. Set aside to cool.
4Trim the roots off the scallions and separate the white and dark green parts. Set the greens aside.
5Add the white parts of the scallions to the hot grill pan and sear for 1–2 mins per side, pressing down gently with a spatula or grill press to get even color.
6At the same time, add the garlic cloves and avocado oil to one side of the pan and sauté for 2–3 mins until fragrant and golden. Set scallions and garlic aside to cool.
7To a blender, add the sautéed garlic, 4 of the seared scallions, lemon zest and juice, vinegar, olive oil, miso, and 1/2 tsp salt.
8Blend until smooth and creamy.
9Add the dill and blend again until fully incorporated. Taste and adjust salt or acidity as needed.
10Cut the corn kernels off the cob.
11Thinly slice the remaining cooked scallions and raw scallion greens.
12Add the corn, scallions, artichoke hearts, edamame, oregano, arugula, and red pepper flakes to the bowl of orzo.
13Pour the dressing overtop and toss well to coat.
14Taste and adjust seasoning with more salt or lemon juice.
15Serve immediately or chill for later.
16Top with vegan parm just before serving for extra umami.