Spicy Seattle Tuna Rolls

INGREDIENTS

• 2 teaspoons toasted sesame oil
• 1 tablespoon toasted sesame seeds
• 4 Green Thai chiles, stemmed, coarsely chopped
• 1 tablespoon plus 1 teaspoon grated peeled fresh ginger
• 1/4 cup sunflower or vegetable oil
• 1 garlic clove, coarsely chopped
• 1 1/2 cups (about) cooked short-grain rice, cooled
• Assorted fillings, such as sliced scallions, English hothouse or Persian cucumbers, cilantro leaves, and chive blossoms
• 1/2 teaspoon kosher salt plus more for seasoning
• 1 pound sashimi-grade yellowfin tuna fillets, cut into 1/8" cubes
• 4 toasted dried nori sheets, halved lengthwise
• 1 teaspoon distilled white vinegar