Korean Beef Nachos

Ingredients

• 2 tablespoons light brown sugar, packed
• 2 tablespoons reduced-sodium soy sauce
• 1 teaspoon toasted sesame oil
• 1 teaspoon ginger, freshly grated
• 1/4 teaspoon crushed red-pepper flakes, plus more, to taste
• 1 teaspoon vegetable oil
• 2 cloves garlic, minced
• 8 ounces ground beef
• 1 cup kimchi, chopped
• 1 teaspoon sugar
• 2 tablespoons mayonnaise
• 2 teaspoons sriracha, plus more, to taste
• 12 ounces tortilla chips
• 1/2 cup cheddar cheese, shredded
• 1/2 cup Monterey Jack cheese, shredded
• 2 tablespoons fresh cilantro leaves, chopped
• 1/4 teaspoon sesame seeds