Miso Veggie Burgers

Name: Miso Veggie Burgers
Ingredients: For the Miso Veggie Burgers With Cheat Aioli; 1/2 cup mayonnaise; 1/2 lemon, zested and juiced; 1 garlic clove, finely grated; 6 tablespoons extra-virgin olive oil, divided; 2 tablespoons white miso; 2 tablespoons gochujang; 1 pound sweet potato, peeled and chopped; 1/2 pound cremini mushrooms; 1/2 pound summer or winter squash; 1/2 medium red onion, thinly sliced; 3/4 cup dried red or white quinoa, rinsed; 1/2 cup old-fashioned oats; 2 teaspoons garlic powder; 2 teaspoons kosher salt; 6 hamburger buns, toasted; Pickled radish and onion, for serving; Lettuce leaves, for serving; Sliced tomato, for serving; Pickled Radish & Onion; 2 teaspoons (8 grams) Diamond Crystal kosher salt, divided; 1/2 pound radishes, sliced; 2 serrano chiles, thinly sliced; 1 cup fresh orange juice; 1/2 cup fresh lime juice