Summer Squash and Arugula Pesto Pizza

Name: Summer Squash and Arugula Pesto Pizza
Ingredients: 2 cups (packed) arugula; ½ cup (packed) basil leaves; ⅓ cup extra-virgin olive oil; 1 Tbsp. macadamia nuts or pine nuts; ½ tsp. Diamond Crystal or ¼ tsp. Morton kosher salt; ⅓ cup finely grated Pecorino Romano; ½ cup whole-milk fresh ricotta; 1 tsp. finely grated lemon zest; ½ tsp. Diamond Crystal or ¼ tsp. Morton kosher salt, plus more; 4 squash blossoms; 2 tsp. extra-virgin olive oil, plus more for hands (if using conventional oven); 1 ball All-Purpose Pizza Dough or 12 oz. store-bought pizza dough, room temperature; 1 small summer squash, thinly sliced; All-purpose flour (for dusting; if using pizza oven); Basil or mint leaves (for serving); Freshly ground black pepper